why are the sightings of some comets so many years apart?

Answers

Answer 1

Answer:

they have long elliptical orbits

Explanation:


Related Questions

what are the defense mechanisms of the human body

Answers

Explanation:

The human body has three primary lines of defense to fight against foreign invaders, including viruses, bacteria, and fungi. The immune system's three lines of defense include physical and chemical barriers, non-specific innate responses, and specific adaptive responses.

The human body possesses several defense mechanisms to protect itself against pathogens (disease-causing microorganisms) and other harmful substances such as innate and adaptive immune system.

Innate immunity is the body's first line of defense and is present from birth. It provides immediate protection against a wide range of pathogens. Adaptive immunity is a specific defense mechanism that develops over time in response to specific pathogens. It provides long-lasting immunity and has the ability to recognize and remember specific pathogens. Both innate and adaptive immunity work together to provide a comprehensive defense against pathogens. Innate immunity provides rapid, general protection, while adaptive immunity offers specific, targeted responses. The coordination between these defense mechanisms helps the body combat infections and maintain overall health.

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what is a positive effect on an ecosystem?

Answers

Answer:

Ways in which people positively affect ecosystems around the world include Recycling. Establishing wildlife preserves and parks. Creating green, open space laws.

Explanation:

please answer these

Answers

the first one is 30 I think and the second one is 23
First one is 30 and the second one is 46

1. Which aspects of soil do you think are easiest to change? Which are more difficult
change? Why?

Answers

The most difficult property of a soil to modify is fertility, while the easiest property to modify is texture.

What is the ground?

Soil  is the surface part of the earth's crust, biologically active, which comes from the disintegration or physical or chemical alteration of the rocks and the residues of the activities of living beings that settle on it.

What are the main properties of the soil?

Some of the soil properties are:

Texture. Soils vary among themselves according to the elements that constitute them and their texture changes according to the quantity and size of the particles that form it.Fertility. Soils vary among themselves according to their level of fertility, that is, according to their ability to support plant life.PH. Soils vary from each other according to their level of acidity (pH). The pH is measured on a scale that goes from 1 to 14, with 7 being a neutral pH, less than 7: acidic and greater than 7: basic.Mutation. Soils change over time and due to factors such as the decomposition of organic waste, excessive rainfall, among others.Permeability. Soils vary among themselves according to their permeability, that is, the ability to filter water and air.Structure. Soils vary among themselves according to the way in which the elements and materials that constitute them are grouped.Salinity. Soils vary among themselves according to the percentage of accumulated soluble salts they have.Porosity. The soils vary among themselves according to the number and structure of the pores, which are those soil spaces that are empty, that is, they are not formed by solid matter, but by water and air.

What is the easiest and most difficult soil property to modify?

The easiest property to modify of the floor is the texture because if we want a more rigid or softer floor we can replace it with any material that is available for that purpose. However, this does not guarantee other properties such as fertility, salinity, good pH, among others.

On the other hand, the most difficult soil property to modify is fertility, since this property is the result of very specific physical and chemical processes. For example, we cannot modify the fertility of the soil of a desert.

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True or false: chemical reactions can occur in the cells of living thing.

Answers

Answer:

True or false: chemical reactions can occur in the cells of living thing.

=true

Answer:

True

Explanation:

What do you think happens in your stomach?

The nitrogen bases down the center are held together by?

Answers

Hydrogen Bonds!!!!!!!!

Hello need help ASAP! plz answer if you know the answers

Look at the digestive system, tell me if i did some thing wrong. Thank you guys

Answers

Answer:

yes this should be correct

Explanation:

Help ASAP! tell me if am right ty

Answers

Answer:

you are right

Explanation:

In what organelle the chloroplast process occur in

Answers

Answer:

It occurs in the green tissue.

Explanation:

they are concentrated particularly in the parenchyma cells of the leaf mesophyll.

Answer:

Photosynthetic cells contain special pigments that absorb light energy. Different pigments respond to different wavelengths of visible light. Chlorophyll, the primary pigment used in photosynthesis, reflects green light and absorbs red and blue light most strongly.In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle. In electron micrographs, thylakoid membranes look like stacks of coins, although the compartments they form are connected like a maze of chambers. The green pigment chlorophyll is located within the thylakoid membrane, and the space between the thylakoid and the chloroplast membranes is called the stroma (Figure 3, Figure 4).

Chlorophyll A is the major pigment used in photosynthesis, but there are several types of chlorophyll and numerous other pigments that respond to light, including red, brown, and blue pigments. These other pigments may help channel light energy to chlorophyll A or protect the cell from photo-damage. For example, the photosynthetic protists called dinoflagellates, which are responsible for the "red tides" that often prompt warnings against eating shellfish, contain a variety of light-sensitive pigments, including both chlorophyll and the red pigments responsible for their dramatic coloration.

Photomicrographs of chloroplasts with structures labeled are shown alongside a simplified illustration of a photosynthetic cell with a prominent chloroplast. A portion of the chloroplast illustration is depicted enlarged next to the cell to show the structure of a granum, which consists of stacked thylakoids.

Figure 4: Diagram of a chloroplast inside a cell, showing thylakoid stacks

Shown here is a chloroplast inside a cell, with the outer membrane (OE) and inner membrane (IE) labeled. Other features of the cell include the nucleus (N), mitochondrion (M), and plasma membrane (PM). At right and below are microscopic images of thylakoid stacks called grana. Note the relationship between the granal and stromal membranes.

© 2004 Nature Publishing Group Soll, J. & Schleiff, E. Protein import into chloroplasts. Nature Reviews Molecular Cell Biology 5, 198-208 (2004) doi:10.1038/nrm1333. All rights reserved. View Terms of Use

Figure Detail

What Are the Steps of Photosynthesis?

Photosynthesis consists of both light-dependent reactions and light-independent reactions. In plants, the so-called "light" reactions occur within the chloroplast thylakoids, where the aforementioned chlorophyll pigments reside. When light energy reaches the pigment molecules, it energizes the electrons within them, and these electrons are shunted to an electron transport chain in the thylakoid membrane. Every step in the electron transport chain then brings each electron to a lower energy state and harnesses its energy by producing ATP and NADPH. Meanwhile, each chlorophyll molecule replaces its lost electron with an electron from water; this process essentially splits water molecules to produce oxygen (Figure 5).

An illustration shows the light and dark reactions for photosynthesis drawn on top of a simplified image of a chloroplast, represented as an oviform capsule. Inside the capsule are five stacks of three or four flat, green thylakoid discs. The discs look like stacked quarters. Two thylakoid stacks have been cut away so that their interiors, which are hollow, are visible.

Figure 5: The light and dark reactions in the chloroplast

Photosynthetic cells contain chlorophyll and other light-sensitive pigments that capture solar energy. In the presence of carbon dioxide, such cells are able to convert this solar energy into energy-rich organic molecules, such as glucose. These cells not only drive the global carbon cycle, but they also produce much of the oxygen present in atmosphere of the Earth. Essentially, nonphotosynthetic cells use the products of photosynthesis to do the opposite of photosynthesis: break down glucose and release carbon dioxide.

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List the four different types of solutions.

Answers

Answer:

solid

liquid

gas

.......

Answer:

Explanation:

Gas - (Also known as "Foam")

Liquid - (Also known as "Emulsion")

Liquid - (Also known as "Gel")

Solid - (Also known as "Solid Sol")

Which of the following is not a macromolecule?

A. Carbohydrate
B. Nucleic acids
C. water
D. Lipids​

Answers

Answer:

water

Explanation:

Macromolecules contain a lot of atoms,whereas the water molecule contains only 3

Explain how oceanic crust is continuously created at mid-ocean ridges.

Answers

Answer: Oceanic crust is continuously being created at mid-ocean ridges. As plates diverge at these ridges, magma rises into the upper mantle and crust. As it moves away from the ridge, the lithosphere becomes cooler and denser, and sediment gradually builds on top of it.

When did humans first evolve?
20 million years ago
200 million years ago
0.2 million years ago
2 billion years ago

Answers

Answer:

0.2 million years ago

Explanation:

Correct Answer

Persuasive Letter

I'm writing this because, I would like school to be more fun! First, It would most likely motivate kids to do school, And what I mean by more fun is adding funny pictures, fun fact's, Etc.

How about when Class Connect start's, we could Do this, By example: " The bird on the coordinate jumped on 3, and flew to 7! ". This could make kids use a method to help them do things, More than just coordinate's.

We can decorate K12 by the holiday's! Like, Snowflake's for Christmas, and other's. And maybe a button ( You can only use once) To make it rain around the screen! Like snowflake's, Flower's, Etc.

In conclusion, To make K12 more fun, We could add a little Daily streak that go's up every time you attend Class Connect! This could make Children attend more for their Daily Streak.

This is why K12 should do this.

Sincerely,

Victoria Golubev

(Pts: Kid's would most likely like school more if this will be done!)

Plz help me with this question! ASAP

Answers

Answer:

photosynthesis cells

Explanation:

Ground tissue cells include parenchyma, (photosynthesis in the leaves, and storage in the roots), collenchyma (shoot support in areas of active growth), and schlerenchyma (shoot support in areas where growth has ceased). Parenchyma are the most abundant and versatile cell type in plants

In order to support life a planet will need ...

Answers

Answer:

sun light and water and fresh air

Answer:

The standard definition for a habitable planet is one that can sustain life for a significant period of time. As far as researchers know, this requires a planet to have liquid water. To detect this water from space, it must be on the planet's surface.

Explanation:

:)

In digestion, where are molecules coming from? *
a.From food the animal eats
b.From the blood
c.From the cells

Answers

Answer:

In digestion molecules come from food the animal eats (option a).

Explanation:

Foods that are consumed are those that provide the necessary molecules for the maintenance of the organism. The process of digestion consists of converting food into molecules —amino acids, glucose and fatty acids— that are easily absorbed by the body.

When an animal eats food, its digestive system is in charge of processing it and converting it into simple molecules, necessary to cover its requirements.

3. In what landscape feature are metamorphic rocks generally found?​

Answers

Answer:

Although metamorphic rocks typically form deep in the planet's crust, they are often exposed on the surface of the Earth. This happens due to geologic uplift and the erosion of the rock and soil above them. At the surface, metamorphic rocks will be exposed to weathering processes and may break down into sediment.

Explanation:

Which two statements describe evidence that directly led to the development of the theory of plate tectonics?
A.Sonar confirmed the presence of mid-ocean ridges.
B.Each continent has its own unique mountain formations.
C.Fossils of plants found in South America differ from fossils found in Africa.
D.Seismic data showed that most earthquakes and volcanoes occur where crust is being formed or destroyed.

Answers

Answer: The answer is A and D

Explanation:

Jus pick it if you trust me

Two statements that describe evidence that directly led to the development of the theory of plate tectonics? a) Sonar confirmed the presence of mid-ocean ridges. d) Seismic data showed that most earthquakes and volcanoes occur where crust is being formed or destroyed.

What is plate tectonic theory?

According to this theory, the earth's surface is separated by plates that move above the molten mantle. Over the plate borders, these plates interact with one another, causing friction.

What is seismic data?

Seismic surveys provide a scan of the earth's subsurface using reflected sound waves.

By knowing the speeds at which seismic waves move through rocks at various places and depths, we can learn about geologic formations on the earth. and describes the way an area will tremble during an earthquake.

Hence, options (a) and (d) are correct.

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What body system are capillaries from? Provide evidence from the internet. (This can be a short sentence lol)

A) Respiratory System
B) Muscular System
C) Reproductive System
D) Circulatory System
E) Digestive System
F) Nervous System
G) Excretory System
H) Endocrine System
I) Skeletal System
J) Immune System

Answers

Answer:

Circulatory System

Explanation:

Capilaries are tubes that transport blood and provide nutrition through diffusion in tissues. Transporting blood is a function of the circulatory system.

HELPPP PLEASE AWO
During anaerobic respiration in humans, glucose is converted into what two products?

Answers

Answer:

Anaerobic cell respiration (glycolysis + fermentation) produces 2 ATP/glucose consumed. Aerobic cell respiration (glycolysis + the Krebs cycle + respiratory electron transport) produces 36 ATP/glucose consumed.

Explanation:

Anaerobic respiration (without oxygen)

During glycolysis, glucose molecules (six-carbon molecules) are split into two pyruvates (three-carbon molecules) during a sequence of enzyme-controlled reactions. This is the same reaction as occurs in aerobic respiration.

Answer:

Explanation:

Glycolysis breaks down glucose (6-C) into two molecules of pyruvate (3C), and also produces: Hydrogen carriers (NADH) from an oxidised precursor (NAD+) A small yield of ATP (net gain of 2 molecules)

Why are chromosomes important to mitosis?

Answers

Answer:

The daughter cells need a copy of every chromosome in order to replicate and separate.

Explanation:

Cells have to replicate their genetic material to make a whole other cell. Before mitosis the cells need this step for mitosis.

Answer:

The fundamental importance of chromosomes is that they contain DNA, or deoxyribonucleic acid, the substance that contains every organism's genetic code. When a cell divides, its chromosomes must first replicate. Cells divide in two basic ways – mitosis and meiosis. The latter type of division incorporates the former.

Explanation:

Help ASAP PLZ! CORRECT ME IF AM WRONG TY BOYS AND GIRLS

Answers

You’re correct. They stay dormant until the apical meristem is removed.

WHICH BODY SYSTEM IS A LOOP?

A.) Circulatory
B.) Nervous
C.) Respiratory

Answers

Answer:

A. circulatory

Explanation:

what is the Biogenesis Theory?

Answers

Answer:

Biogenesis is the production of new living organisms. Conceptually, biogenesis sometimes attributed to Louis Pasteur and encompasses the belief that complex living things come only from other living things, by means of reproduction.

:)

Which principle states that sedimentary rocks are deposited as large
sheets of sediment?
Lateral Continuity
original horizontality
Correlation

Answers

Original horizontality is the answer.
Original horizontality is the corrects answer

what is Skeletal major organs and structures?

Answers

Answer:

The skeletal system is your body's central framework. It consists of bones and connective tissue, including cartilage, tendons, and ligaments. It's also called the musculoskeletal system.

Explanation:

What four body plan innovations were found in an ancient flatworm

Answers

Answer:

Four innovations are central nervous system, eyes, bilateral and hermaphrodites.

Explanation:

Innovations found in an ancient flatworm were the presence of central nervous system means head and a brain. The head had eyes which is the first in the animal world. Their body is bilateral means equally divided into two parts. They are also hermaphrodites means having male and female on a single organism which was not present at that time of animals.

heeeeeeeeelp
ASAP its due now

Answers

Answer:

Student 2

Explanation:

Divergent boundaries happen when two continental plates move away from each other causing seafloor spreading.

Hope this helps :D Have a great day

Use the drop-down menus to complete these

sentences.

Plants capturing light energy to form simple sugars

using water and carbon dioxide is called

Plants need carbon in the form of

DONE

DONE

Carbon-containing energy sources formed from

the decomposition of prehistoric organisms are

called

Breaking down glucose to provide energy in the

form of ATP for metabolic processes is called

DONE

DO NE

Answers

Answer:

Plants need carbon in the form of

✔ carbon dioxide.

Breaking down glucose to provide energy in the form of ATP for metabolic processes is called

✔ cellular respiration.

Plants capturing light energy to form simple sugars using water and carbon dioxide is called

✔ photosynthesis.

Carbon-containing energy sources formed from the decomposition of prehistoric organisms are called

✔ fossil fuels.

Explanation:

edge2021 Biology A

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Explain the scientific meaning and use of the word "transformation".

Answers

Answer:

The act, state or process of changing, such as in form or structure; the conversion from one form to another.

Explanation:

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