Why is evolution considered a theory?
A. It was proposed by a scientist.
B. It cannot be proven.
C. It is a guess about what happened.
D. It is backed up by scientific evidence.

How do antiviral drugs work? in your own words.

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system