Captive breeding programs are used to

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird

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.