Answer:
true
Explanation:
the lower respiratory tract contains:- trachea, bronchial tree, and lungs.
which type of transport requires energy to move a cell
Describe the role of a nebula in the life cycle of a star. Please use your own words
Answer:Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size.
A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.
Generally, a star consists of two (2) main interstellar hot gas and these are:
I. Hydrogen (H).
II. Helium (He).
Some of the examples of a star are;
Sun (the closest to planet Earth). Antares. Canopus. Vega. Betelgeus.
A nebula simply refers to a low-density cloud of interstellar hot gas (hydrogen and helium) and dust.
Basically, a nebula is needed for the creation or formation of a star.
Hence, the role of a nebula in the life cycle of a star include the following:
Stage 1: The temperature increases in the center of a nebula, thereby, causing the small nuclei of atoms to fuse.
Stage 2: The nebula gets hotter and brighter as the nuclear fusion sets off a chain reaction while providing enough energy to turn the nebula into a star.
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Compare the normal allele for hemoglobin with the sickle cell allele. How does this difference affect the person’s red blood cells?
Answer:
Sickle cell anemia is an inherited condition in which there aren't enough healthy red blood cells to carry oxygen through an individual's body. The red blood cells of a healthy individual are flexible and round, and they move through blood vessels with no problem, transporting oxygen successfully. However, a person with sickle cell anemia has rigid, sticky red blood shaped like sickles or crescent moons. These cells often get stuck in small blood vessels, which can slow or block blood flow and oxygen delivery to different parts of the body.
The sickle cell anemia trait is found on a recessive allele of the hemoglobin gene, while the regular red blood cell trait is found on the dominant allele. This means that a person must have two copies of the recessive allele (one from their mother and the other from their father) to be born with this condition. People who have one dominant and one recessive allele or both dominant alleles will have healthy red blood cells.
One of the key elements in creating a green economy is the construction of ________________.
a.
green buildings
c.
solar panels
b.
a new tax system
d.
a new workforce
Answer:
A One of the key elements in creating a green economy is the construction of green buildings.
Explanation:
Any economy relies on businesses and buildings, so a green economy is going to need green buildings to support a green economy as well.
please help me with this question:)
Answer:
i believe mitochondria
Explanation:
I can't see it very well because it's blurry but if it has back and forth squiggles in the middle then it is the mitochondria plus the others are labeled with other stuff
Given that almost all organisms obtain energy from food by the process of cellular respiration, which is the most likely explanation for what prevents Earth from running out of oxygen? A. The net effects of the reactions of photosynthesis and cellular respiration are the opposite of one another, therefore the products of one are the reactants of the other, creating a cycle. B. The energy flow—and thus oxygen flow—for cellular respiration and photosynthesis take place in the same direction, and therefore build upon one another. C. Cellular respiration is a process that releases energy and oxygen, while photosynthesis withdraws energy and uses oxygen, therefore keeping each process in balance. D. Oxygen readily accepts electrons, so cellular respiration uses a negligible amount of oxygen.
Answer:
a
Explanation:
ther are many explanation
Identify the parts of the DNA molecule below
Explanation:
where is question or diagram
PLEASE HELP ME WITH THIS QUESTION
Answer:
I Think, point no.4 is answer.
How are coral reefs similar to tropical rainforests?
Ó Both are home to just a few types of rare animals.
Both can easily be restored if they are destroyed.
Both support a huge quantity and variety of organisms.
O Both are found in all types of climates around the world.
Answer:
Both support a huge quantity and variety of organisms.
Explanation:
Which of the following questions would BEST
determine whether a plant is undergoing the
Calvin cycle?
A. Is NADPH being produced?
B. Is oxygen being produced?
C. Is glucose being produced?
D. Is ATP being produced?
Answer:
C
Explanation:
Glucose is the end result of the calvin cycle. It is not Oxygen, NADPH, or ATP because those are produced in the light reactions.
Is glucose being produced? is the question which will best determine
whether a plant is undergoing the Calvin cycle.
The Calvin cycle is known s the light independent or dark reaction which
takes place during the process of photosynthesis by plants. The final
product for this cycle is Glucose.
Other compounds such as NADPH, ATP and oxygen are all formed during
the light dependent reactions which is why asking if glucose is produced is
the most appropriate choice.
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What makes you throw up? Explain why and how you know.
school pizza makes me throw up it just tastes so fake yk
Answer:
Explanation:
causes of vomiting in adults include: Viruses (gastroenteritis, aka “stomach flu”) and bacteria (food poisoning). Overindulgence (drinking too much alcohol or smoking too much marijuana). Medical conditions (pregnancy, motion sickness, migraines, vertigo).
ALOT OF POINTS MARKING POEPLE AS BRAINLIST ⚠️⚠️
7. List 5 factors, other than the lynx, that could change the number of hares.
Answer:
1. Weather
2. Humans
3. Grass
4. Lynx's Predators
5. Other Grass eaters
How many hydrogen atoms are present in each water molecule?
A.
1
B.
3
C.
2
D.
4
Answer:
C. 2
Explanation:
Why do you think prokaryotic cells do not have all the organelles that eukaryotic cells do? What does this tell you about prokaryotic cells?
Answer:
Explanation:
A prokaryotic cell is a type of cell that does not have a true nucleus or membrane-bound organelles. Organisms within the domains Bacteria and Archaea are based on the prokaryotic cell, while all other forms of life are eukaryotic
A prokaryotic is a primitive cell that lacks organelles, unlike the eukaryotic cells, and are simple organisms.
What are prokaryotes?Prokaryotes are organisms that are simple and evolved before the complex eukaryote. They include bacteria and archaea that are simple and lack organelles that are found in eukaryotes.
They do not have a nucleus and rather have their genetic material disposed of as nucleoids in the center of the cell that undergoes the simple process of the central dogma.
The simple cellular processes and reproductive methods are the reason they lack many organelles. This tells that prokaryotes are simple and primitive types of cells.
Therefore, prokaryotes lack a distinct nucleus.
Learn more about prokaryotes here:
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Which cellular structure in plant cells is most responsible for having less flexible animal cells
Answer:
The cellulose cell wall in plants
Explanation:
All eukaryotic cells, both plant and animals cells have a cell membrane which is an outer covering of the contents of the cell. Also plants and animals cells have many structures and cell organelles in common such as the mitochondria, the endoplasmic reticulum, ribosomes, golgi bodies, etc. However, plant cells have a more rigid structure than animals cells because of the presence of an extra structure known as the cell wall, covering their cell membranes.
The cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell, providing structural support and protection. The cell wall is composed mainly of cellulose, but contains proteins as well as other polysaccharides too.
Another structure present in plants that serves to maintain the rigidity of the plant cell is the large central vacuole. The main role of the vacuole is to maintain turgor pressure by pushing the plasma membrane against the cell wall due to the pressure of fluids contained within it.
what is mean by exc
Answer:
QEMM Exclude file for Optimize (do not process the data) Computing » File Extensions.
What is true about sex chromosomes?
A. They carry genes for traits including those not related to sexual
characteristics.
B. In humans, both types of sex chromosomes are the same size.
C. A daughter receives both copies of her sex chromosomes from
her mother
D. They do not sort independently during meiosis.
To produce the highest possible oxygen concentration in the blood, gas exchange occurs in
only one direction at the respiratory membrane-from the lung to the blood.
O True
O False
Answer:
True
Explanation:
Answer:
false
Explanation:
The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell. When oxygen passes into the bloodstream, carbon dioxide leaves it.
How does the structure of bone allow it to function with the immune system? (PLEASE HELP QUICK THEYRE COMING)
Answer:
In addition to providing a structural support for the body and a reservoir for calcium, bone encases the bone marrow, a primary site for hematopoiesis and immune system development.
Explanation:
HELP ME ASAP!!!!
Select the correct answer.
Gina is scuba diving when she notices a large fish glide over her. It has a flattened body and she notices gills on its underside. Which taxonomic
group does the fish belong to?
A.
Selachii
B.
Batoidea
C.
Sarcopterygii
D.
Actinopterygii
Answer:
Your answer is B) Batoidea. Batoidea is a superorder of cartilaginous fishes commonly known as rays.
Answer:
b because the guy above me said so
True or False. Mature proglottids contain both male and female reproductive organs.
Which term refers to the fact that naturally occurs omg he universe
Answer:
Scientific law.
Explanation:
A scientific law is a statement that the scientific community elaborates on after observing a natural phenomenon and performing several experiments concerning certain phenomena. Scientific laws aim to explain the reasons why something happens and what may cause it to predict it in the future.
What is the effect of the presence of double bonds in plant lipids?
A) the double bonds do not affect the properties of plant lipids
B)the double bonds cause plant lipids to freeze more quickly
C)the tails of plant lipids cannot pack as tightly together as animal ones
Answer: Option C.
C)the tails of plant lipids cannot pack as tightly together as animal ones
Explanation:
The tails of plant lipids cannot pack as tightly together as animal ones because the double bond in plant lipids make the hydrocarbon chains to bend making them no to pack tightly together which cause a reduction in van der Waals interaction between the fatty acids. The length of the double bond also affect the melting point of fatty acids . If the hydrocarbon chain is long, melting point will be high .
When does the Mitosis-promoting factor (MPF) Cyclin concentration decline during a typical cell cycle in clam eggs?
A. when the cells grow larger
B. when DNA is synthesized
C. when haploid gametes are produced
D. when the cell nucleus divides
Answer:
D
Explanation:
Answer:
D
When the cell nucleus divides
Explanation:
The two kinds of cells are Prokaryotes and Eukaryotes. How are they
different? *
O Prokaryotes have a nucleus.
OEukaryotes have a nucleus.
O Prokaryotes are plant cells
оThere is no difference.
Why is it important that animals have different characteristics? Include at least two examples of animals and their characteristics.
Answer:
some animals have 4 legs and some have 2
Explanation:
Put the boxes in the correct order
Answer:
This was the question you asked earlier and you deleted it after i wrote a whole essay so here. I hope its still of some use.
Explanation:
I believe the most useful ap to use for people of age is Faceb00k. Faceb00k is a safe and friendly app where people can share what there doing or pictures.
So many parents and grandparents use this today to share photos of younger family members, and others can like and comment on there posts. Although their are some who receive hate, most of the people are quite rather friendly.
People like to share there appreciation for l0ved ones by letting the whole world see them through Faceb00k. Most elderly people do this so there younger ones can look back at all the memories they had together. Yes, its true they can just not post it and still look back at memories, but they post it because if it gets deleted and you posted the photos online there will always be a way to recover them.
In conclusion, this is why I believe Faceb00k is the best ap for the more elderly people. Firstly, they can show there memories to the world by showing appreciation. And lastly, whenever you post something online it can always be recovered, so those valuable moments will not be forever lost.
a balloon expands and shrinks. which type of cell does the balloon best model? a. guard cell, b. bone cell, c. nerve cell, d. epithelial cell
Answer:
Guard Cell
Explanation:
Answer:
The Answer is Guard Cell
Which equations are used to calculate the velocity of a wave?
Answer:
The Wave Equation
Multiplying the wave's frequency by its wavelength, which is its physical length, yields the velocity of the wave.
Explanation:
Answer:
Just v = f × λ
v is the wavespeed in m/s, f is the frequency (Hz) and λ is the wavelength (m)
what is accuracy, precision, and reproducibility ? and why are they so necessary in conducting/designing experiments
Answer:
- Accuracy is the degree by which the measures obtained in an experiment and/or observational procedure are associated with true values.
- Precision is the level of reproducibility that these measurements exhibit in the same (constant) conditions.
- Reproducibility indicates the level of agreement of the results when they are obtained by different researchers by applying the same experimental and/or observational procedures.
Explanation:
In a scientific investigation, it is imperative to achieve higher levels of accuracy and precision when realizing measurements because it ensures that the information is correct (without mistakes). Thus, researchers always try to use better equipment and instrument to make their measurements. Reproducibility is important because it is the only condition that scientists can guarantee to other researchers when they arrive at a result.