<span>Heat and gases contracted within a nebula.</span>
Answer:
Mutations generate the variation on which natural selection acts. the change in DNA sequence may even turn out to be beneficial to the organism. has a deleterious affect on the phenotype of the offspring, the mutation is referred to as a Every genetic feature in every organism was, initially, the result of a mutation.
Explanation:
Answer:
A.
Explanation:
When an electron gets excited it moves into a different orbital. Light is produced when the electron falls back to its original orbital.