Which statement describes how heterotrophs depend on autotrophs for survival? A) Autotrophs supply oxygen for respiration.
B) Autotrophs provide sunlight for respiration.
C) Autotrophs make lactic acid for respiration
D) Autotrophs produce carbon dioxide for respiration

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.