Answer:
4
Explanation:
Diploid means 2n
Haploid means n
Here we have 2n=8 (because fruit fly has diploid cells with 8 chromosomes) to get to n which is haploid divide by 2, you get n=4
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Hello!</h2>
The answer is:
b. 
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Why?</h2>
The centripetal acceleration or radial acceleration is present when an object is moving to describe a circular path. The centripetal acceleration is always perpendicular to the direction of the velocity and going inwards and towards the center.
The centripetal acceleration can be calculated using the following equation:

From the statement we know that:

So, calculating we have:

So, the correct answer is:
b. 
Have a nice day!
Answer:
The correct answer is option d. "secondary active transport by an antiporter".
Explanation:
The cotransport of calcium and sodium at which one calcium ion moves out of the cell and three sodium ions move into the cell is known as secondary active transport by an antiporter. It is secondary because it uses a form of energy different from ATP, is an active transport because the calcium ion moves against its gradient, and its done by an antiporter which is an integral membrane protein that function as a cotransporter.
The nine different classes of the vertebrates,
-mammals
-birds
-reptiles
-amphibians
-ray finned fish
-lobe finned fish
-lampreys
-hagfishes
-sharks,skates, ray, ratfishes
Please tell me if you would like the scientific names, thank you!
An organelle found in large numbers in most cells