I believe the answer is B. Annelids. :)
A gene pool is the set of all genes in any population that is of a certain species.
Answer:
Mutation
Explanation:
Mutation is a change in the nucleotide sequence by addition, deletion, substitution, etc which results in the slow addition of allelic variation that increases the diversity in a population and leads to evolutionary change.
The right mutation in the allele or gene is favored by nature and it is passed in the next generation through reproduction. Mutation helps in the survival of a population in the continuously changing environment by adding new alleles that increase the fitness of the organism. So the correct answer is mutation.
There are 4 chromosomes that are visible at the beginning of Mitosis.
