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.
True. Biking or walking exercises the leg muscles more than riding in a car would.
Most likely your body won't be as harmed the 2nd time due to the preparation of your cells.
Yes. this is true! sit at a desk with good back support
