Answer:
"Genetic Diversity" best explains why Caitlin has blue eyes and Jack has green eyes.
Explanation:
It can be known as the total genetic characteristic in the genetic make up of species. It can also be differentiated from the genetic variability, which explains the tendency of variation of genetic characteristic. It also serves as the way for various populations to adapt to environmental variation. It is an important phenomenon which further helps in maintaining the health of the population which includes the alleles which are important for resisting diseases.