Answer:
a.
b.
Explanation:
a.We are given that


Using partial fraction decomposition of the given function

Using the formula

b.

Using property 

Using the property

The obvious choice would be the hox gene.
It means to take certain types o the organism that have favorable traits and breed them to keep producing such favorable traits, such as continually breeding fatter chickens or cows, or certain breeds or pure-bred dogs.
The answer is B and that is the same reason that everything stays on the Earth because it has very strong gravity.