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marysya [2.9K]
3 years ago
9

Which of the following would be an example of how a model can be used in science.

Biology
1 answer:
mrs_skeptik [129]3 years ago
4 0
A. Determining the type of rock a a geological site.
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Which of the following does natural selection act directly upon? Alleles, genes, individual organisms, or mutations?
Inga [223]

Natural selection act directly upon <u>Alleles</u>

Explanation:

Genes, such as that of fur color, have many variants called alleles. Natural selection act on the alleles and chooses the best fit for an environment and eliminates the disadvantageous ones from the population over generations. Mutations are a rare occurrence that increases the number of allelic variants of a genes on which natural selection can act upon.

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What’s the answer???
Fittoniya [83]

Answer:

Excess nutrients from fertilizer runoff

Explanation:

The nutrients can create bacteria for the algae

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In what kind of star system does one star sometimes block the light from another?
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Cells must use energy to move a substance against a concentration gradient i.e., from a compartment with a low concentration of
garik1379 [7]

Answer:

Transport of sodium ions out of the cell

Transport of potassium into the cells

Transport of calcium ions out of cell

Transport of calcium ions OUT OF the cytoplasm of a cell and INTO an organelle that has a high concentration of calcium ions.

Explanation:

In general the concentration of sodium ion is higher outside the cell in the extracellular fluid and the concentration of potassium ion is higher inside the cell.  

During an active transport, a cell uses energy to move molecules against the gradient as a part of primary active transport. In the secondary active transport, the molecules move as per the electrochemical gradient established by the primary active transport.  

In primary active transport, sodium ion moves out of the cell and potassium ion moves into the cell through the assistance of sodium potassium pump. In order to maintain the stability, calcium ion from the sarcoplasmic reticulum is pumped out of the cell

Hence , the correct answers are

Transport of sodium ions out of the cell

Transport of potassium into the cells

Transport of calcium ions out of cell

Transport of calcium ions OUT OF the cytoplasm of a cell and INTO an organelle that has a high concentration of calcium ions.

8 0
3 years ago
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