What is the main function of these organs? A. To eat and break down food
B. To transport materials to and from body cells
C. To see and help the body respond to the environment
D. To take in oxygen and remove carbon dioxide

What is the next step in muscle contraction after the actin changes shape? (apex)

The largest unit within which gene flow can readily occur is a

Which of the following statements best distinguishes a hypothesis from a theory? a. theories are hypotheses that have been proved. b.hypotheses are guesses; theories are correct answers c. hypotheses usually are relatively narrow in scope; theories have broad explanatory power. d. theories are proved to be true; hypotheses are often contradicted by experimental results.