The first one, Added removed or changed. Mutation as in anything that would cause the slightest change.
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Answer:
A. vitamin A is the best answer to your question
Answer:
the reaction, dehydration synthesis im pretty sure
