What is the correct answer?

Answer:

D

Explanation:

Because ice less dense than the water.

Answer:

1. The students are trying to model a solar eclipse.

2. The golf ball represents the moon in this context.

3. For this type of eclipse to be made possible, the both the Earth and the Moon must be in allignment with the Sun, while the Moon also has to be between the two.

Answer:

The cell membrane

Explanation:

The arrow is pointing to the outside ¨shell¨ so to speak which is the cell membrane, bacteria do not have cell membranes

Answer:

Chargaff's rules state that DNA from any species of any organism should have a 1:1 stoichiometric ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine. This pattern is found in both strands of the DNA.

Answer:

Mutations can occur from the following ways:

1. Errors that occur in DNA replication during cell division

2. Exposure to high-energy electromagnetic radiation

3. Exposure to chemicals mutagens

Effects of mutation include:

1. Genetic disorders

2. Cancers

Explanation:

A mutation is a change or alteration that occurs in the DNA sequence of a cell of an organism. These mutations can be passed on to offsprings of that organism. Mutations can occur from the following ways:

1. Errors that occur in DNA replication during cell division: during the process of cell division, the DNA in cell are copied many times. Some errors result when copying DNA, most of which are corrected during proofreading. However, some changes in the DNA sequence may not be corrected, thus resulting in a mutation.

2. Exposure to high-energy electromagnetic radiation: some types of electromagnetic radiation are ionizing, such as UV rays and X-rays. Prolonged exposure to these ionizing radiation may result in permanent damage to parts of the DNA, thereby resulting in a mutation.

3. Exposure to chemicals mutagens: mutagens are substances which are able to cause mutations. Some common chemical mutagens are alkylating agents such as ethylmethane sulfonate and N-methyl-N-nitrosourea.

Effects of mutation include:

1. Genetic disorders: in genetic disorders, certain normal functioning of the body processes are impaired. For example, hemophilia whereby blood lacks the ability to clot normally resulting in excessive bleeding.

2. Cancers: cancers occur when the cell of the body differentiate and grow abnormally. Various types of cancers include breast cancer, prostrate cancer, blood cancer etc.

Answer:

Food and feeding

The long-tailed widowbird's diet generally consists of seeds, supplemented occasionally by arthropods. The birds do most of their foraging in flocks on the ground, though they are occasionally observed hawking insects airily.

Answer:

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- double circulation of blood means that the blood passes through the heart two times per circuit.

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Explanation:

Answer:

It is adaptation

Explanation:

I had this question on my test last week

Answer:

40

Explanation:

Each quadrant measured = 2m X 2m

Length = (2+2+2) m = 6m

Width = 2m

Total area = area of (quadrant 1 + quadrant 2 + quadrant 3)

Total area = 6 * 2 = 12 m^2

Number of coral found in dive 1 = 4

Population density = 4/12 = 1/3 (0.33)

Now,

=> Population density = (Predicted population)/area

=> 1/3 = PP/120

=> PP = 120/3 = 40

So, the required answer is 40.

The predicted population of brain coral in a reef covering 120m² is ; ≈ 40

First step : Calculate the value of the default population density

Population density = population size (dive 1) / total area

                                                                = 4 / 12  = 0.33

Total area ;

∑ Area of each reef quadrant = length * width = 2 * 2 = 4m²

∴ Total area = 4 + 4 + 4 = 12m².

Final step : Determine the value of the predicted population of brain coral

Population density = ( predicted population ) / predicted area

0.33 = ( pp ) / 120m²

∴ Predicted population ( pp ) = 0.33 * 120

                                                 = 39.6 ≈ 40 brain corals

Hence we can conclude that the predicted population of brain coral is 40

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Answer:

Cells are the structure that makes up every living thing.

Explanation:

Answer:

somatic

Explanation:

Answer:

B. the water table

Explanation:

The question above is related to the topic on "Groundwater."  

Groundwater is considered "fresh." It falls into the soil and gets soaked in it. It can stay stored for many years. It is very beneficial because it serves as a source of water for many residential places.

The storage of groundwater relies on two zones: unsaturated zone and saturated zone. The unsaturated zone is the first layer under the surface area of the land. It is followed by the "water table," which lies a little farther from the land surface. After which is the saturated zone where you can find particles of different rocks.

The top of the saturated zone is known as the water table. Therefore, option (B) is correct.

The water table divides the saturated zone, where water fills the crevices between soil or rock particles, from the unsaturated zone, which is air-filled. Precipitation, groundwater exploitation, and seasonality affect the water table. It controls groundwater supply and flow.

Spring or surface water bodies can form where the water table meets the land. Managing water supplies, analysing groundwater flow patterns, and assessing groundwater contamination require water table monitoring.

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Answer:

Cell X

Explanation:

Cell X is the only cell that has chloroplasts, a pigment found in leaf cells of plants / sometimes other parts may have too. Animal cells almost never have chloroplasts

Answer:

The lytic cycle.

Explanation:

HIV is a retrovirus that has a special enzyme called transcriptase reverse, which can synthesize DNA using RNA as a template. This replication system is particularly useful for the virus because the DNA synthesized from the RNA viral genome can be then integrated into the human chromosomes and stay inactive for years. This is called a lysogenic cycle and is characterized by a latency of the virus and an integration to the host DNA.

When there is a triggering event, this latent virus can be excised from the human chromosome and start producing copies of itself using the host machinery. Then the virions are assembled and after that they lyse the host cell and release new infective units that can then infect neighboring cells. This is called the lytic cycle of the virus and is the reproduction cycle that occurs when a person moves into the acquired immunodeficiency syndrome (AIDS) stage of HIV infection.

Answer:

The type of mutation that occurs when in the DNA strand there is a change from guanine to cytosine is a nonsense mutation, since the triplet that should encode the amino acid encodes a stop codon and the protein cannot be completely synthesized.

Explanation:

The nonsense mutation consists of a change in one of the bases of the stranded DNA, which is transcribed into an altered mRNA, producing a stop codon, instead of an amino acid.

In the table it is observed that the CCA codon is a stop codon that cuts off the protein synthesis prematurely, leaving it incomplete and probably non-functional.

Sometimes this type of mutation can alter the sequence of amino acids but the protein may be complete enough to partially fulfill its function.

Answer:

an element is made of 1 atom

Explanation:

probably an atom is smaller

Answer:

True

Explanation:

Atom is smaller than Element , Because atoms are smallest indivisible particles of matter and the only substances considered to be smaller than the atom are the sub atomic particle Eg proton electron neutron

Answer:c salt ions move out of the cell

Explanation:

Salt is less than 1

Red blood cells have a salt content of 0.9%. When a microbiologist places red blood cells in pure water, osmosis occurs. This results into water molecules . Thus, the correct option is C.

Osmosis is the spontaneous net movement or diffusion of solvent molecules through a selectively-permeable membrane from a region of high water potential or lower solute concentration to a region of low water potential or higher solute concentration, in the direction which tends to equalize the solute concentrations on the two sides of the membrane.

It is of two types, on the basis of movement of solvent particles, when the solvent moves inside the cell it is called endosmosis which results into turgid cells and the movement of solvent molecules outside the cell which is called exosmosis that results into flaccid cells.

Therefore, the correct option is C.

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Answer:

This question is incomplete as it lacks a word bank, the word bank are:

Ions

Electrons

Isotopes

Molecules

Covalent

Negative

Ionic

Molecular

Hydrogen

Point

Element

Ionic compound

The answer is:

1. Ions

2. Ionic

3. Covalent

4. Molecule

Explanation:

An ION is a charged atom i.e. an atom with positive (+) or negative (-) charge, which results when an atom loses or gains electrons respectively. The ions of different elements are held together by bonds called IONIC BONDS, which are bonds that form as a result of the difference in electric charges or electrostatic forces between the atoms involved. For example, an ionic bond forms between NaCl because there is an electrostatic force between the positive Na+ ions and negative Cl- ions.

However, on the contrary, when electrons are shared between atoms, a COVALENT BOND is formed. The atoms share their valence electrons to form a MOLECULE, which comprises of two atoms.

Answer:

mutation caused by the addition of a nucleotide to an already existing gene sequence called deletion duplication insertion inversion

Explanation:

Answer:

C. Transform

Explanation:

A transform plate boundary occurs when two plates slide past each other.

Answer:

The phloem carries important sugars, organic compounds, and minerals around a plant. Sap within the phloem simply travels by diffusion between cells and works its way from leaves down to the roots with help from gravity. The phloem is made from cells called 'sieve-tube members' and 'companion cells'.

Answer: Leaves

Explanation: online school

Answer: I think it is d

Among the given options, immigration is considered as the limiting factor to a population. Thus, the correct option is D.

A Population may be defined as the number of individuals of the same species living in a particular area at a definite time. It also represents the number of males and females in any population with respect to their characteristics.

Competition, predation, and human disturbances are responsible for the reduction of any population. This is because these factors generally involve the ultimate death of individual and health damage.

While immigration is typically a process through which an individual has come in order to live in that place. This place is not native to the individual. This increases the population of any specific region.

Therefore, among the given options, immigration is considered as the limiting factor to a population. Thus, the correct option is D.

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Answer:

Carbon dioxide

Answer: It's A!!

Explanation:

Answer:

diploid spores

In seedless plants, haploid gametophytes are produced from a diploid spores that undergo mitosis.

Explanation:

Answer:

Answer:

The answer issssssss surely D

Answer:3,6,4,5,2

Explanation:

Answer:

40 million years ago

The earliest whales that we think were fully aquatic, that is, they never left the water, are found around 40 million years ago, during the middle Eocene. That means that the transition from terrestrial animals to fully aquatic animals took about 12 million years.

Explanation:

Answer:

After they nursed under water

Explanation: