Answer:
By domesticting plants and animals, humans were able to modify the plants and animals to suit their needs.
Explanation:
Early humans didn't know that domesticting and manipulating plants and animals is explained through biology, nor did they have the term "biology", however, domestication certainly contributed to people becoming curious as to how and why these processes worked.
Answer:
The blood brain barrier blocks chemicals from entering brain tissue.
Explanation:
D. living things as a reservoir
1. B: AA or aa (homo means "the same," these are identical traits.)
2. B (hetero means "different", and these are different types of traits."
