Which statement best describes the scientists who have contributed to our current body of scientific knowledge?
A. They were mostly in the United States.
B. They were from all parts of the world.
C. They were mostly from Asia.
D. They were mostly from Europe.

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

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid