Hello there!
I'd say A) Crop rotation has nothing to do with soil mismanagement. It's not particularly effecting the soil in a bad way. Hope this helps.
Assuming that you are making the two chromosomes as homologous pairs. You would need to make the two chromosomes relative size because they represent the same genes. One chromosome is from the mom and the other from the dad. If you are making chromosomes for one person they can vary in sizes.
This is easy. you move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be on the exponet of 10. If the decimal is being moved to the right, the exponet will be negative. If the decimal is being moved to the left, the exponet will be positive.
In this case you are moving to the left so it's positive.
The answer will be ' 1.43 × 10^9 '
C) centrioles is correct
All other parts have important functions but only centrioles help with chromosomes
I pretty sure it's the uterus