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.
Answer:
What makes me happy is getting to be more fit with my friends. My mood is usually excited and happy when I am there!
Muscle tissue unless it's called something different In your book
