I think that would have to do with the food chain
Answer:
They are Uracil, Thymine, Guanine, Adenine, and Cytosine.
Explanation:
I believe you're asking which word applies to this definition.
If that is the case, the word is Replication
Genetic variation is the variation in the DNA sequence in the genome of an organisms. Organisms of a species have similar characteristics but they are not identical due to genetic variation. Genetic variation is important in the survival and the adaptability of a given species of organism. Therefore, in this case lack of genetic variation necessary to adapt to change in the environment will lead to extinction of the fish species that lacks the variation.