Select the correct text.
Which of the following is the correct definition of biomass?

the total amount of organic matter from plants and animals in a habitat

all materials that form from the remains of living organisms

hydrocarbons and nitrogen oxides that are released when materials are burned

(This is for PLATO)

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.