Agroup of students is doing a project on a lake ecosystem. the lake looks suspiciously green. no sunlight penetrates through. what impact could this situation have on the lake's ecosystem?

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.