Answer:
Mutations deletion are always harmful. add new genes to a gene pool. are never beneficial to survival. give organisms what they need to survive.
Step-by-step explanation:
It may be randomly like:
□caused by the mutation of a single gene.
OR
□genetic disorders include cystic fibrosis, sickle cell anemia, Tay-Sachs disease, phenylketonuria and color-blindness, among many others.