7. All the recolonizing species are autotrophs. How do they get their energy?

[] photosynthesis
[] predation
[] cellular respiration
[] decomposition

8. Most organisms were unable to live in the area for the first six months after the eruption. After the pioneer species, what organisms to you expect to begin inhabiting the area?

[] secondary consumers
[] tertiary consumers
[] primary consumers
[]autotrophs

9. Two types of stickleback fish are found in a lake in British Columbia. One kind of stickleback is large, lives on the bottom of the lake, and eats other fish. The second kind of stickleback is small, lives in the open water, and eats plankton.Based on this information, which of the following statements most likely describes the two kinds of stickleback fish?

[] they are different populations of fish
[] they are different communities of fish
[] are they the same population of fish
[] are they the same community of fish

Autotrophs are organisms which produce food for themselves-from simple to complex molecules. In the case of photosynthesis, producers (plants or some algae) use the light energy to produce complex organic compounds (carbohydrates, fats, and proteins).

8. The correct answer is primary consumers.

Since the pioneer species are usually autotrophs because there is no other source of energy except light energy in the early stages of succession (after the eruption). Most likely, the primary consumer will appear next because they feed upon producers.

9. The correct answer is: they are different populations of fish.

Those two different kinds of fish have unique adaptations that enable them to survive and live in distinct environments. It is most likely that molecular changes underlie adaptation and speciation of those fishes.