A. Build stamina. The Aerobic energy system kicks in roughly 60 seconds into exercises and continues to be used until energy ceases.
Because it can catch another germ or virus
Answer:
Mutations
Explanation:
A gene mutation is a permanent change in the DNA sequence of a gene. Mutations can occur in a single base pair or in a large segment of a chromosome and even span multiple genes. Mutations can result from endogenous (occurring during DNA replication) or exogenous (environmental) factors.
