Which characteristics accurately describe roundworms? Check all that apply.

All roundworms are parasites.
Roundworms are hermaphrodites.
Roundworms reproduce sexually.
Food enters and waste exists the same end of a roundworm.
The nervous system of a roundworm contains a brain and nerve cords.

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.