Answer:
There will be 12 chromosomes
Explanation:
We have given that The epithelial cells in the skin of an animal have 24 chromosomes
We have to find the number of chromosomes present in the gametes of this animal
We know that number of chromosomes present in the gametes is given by

So number of chromosomes in gametes 
B-Kidneys
The kidneys act as filters that strain urea and excess salts from the bloodstream to release them in the urine.
the ATP synthase complex is located in the inner membrane of mitochondria, with the ATP synthesis reaction occurring on the membrane side toward matrix compartment