Which of the following statements is true? a. Carbon-14 can only be used to date rocks.
b. Oxygen speeds the decay of dead organisms.
c. Epeirogenic changes deform the crust.
d. In turbite beds, the bottom layer is older than the top layer.

the answer to your question is:

c. complementary base-pairing

answer; projective;

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).