Question

question 7 evolutionary theory is based on a set of testable hypotheses. scientists opinions about different species. assumptions about when life began. observations of the natural world.

Explanation:

Evolutionary theory is a scientific theory. Scientific theories are based on testable hypotheses that are supported by evidence from research and experimentation. "Scientists' opinions" are not the basis (science relies on evidence, not opinion), "assumptions about when life began" are not the foundation of evolutionary theory (it focuses on how species change over time), and while observations of the natural world inform it, the theory itself is built on testable hypotheses that can be investigated and verified.

Answer:

A. testable hypotheses.