Why is evolution considered to be a scientific theory ?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Defend or refute the argument that the government has too large a presence in the agriculture industry.

Which of the following is a true statement? a. individuals evolve to have adaptations. b. individuals have adaptations that can change over time. c. individuals have traits that may or may not make them successful at reproduction. d. populations cant evolve, only individual organisms.