Which of the following processes plays an important role in the phosphorus cycle?

How is matter transferred directly between organisms?

Which process is used to describe water vapor cooling into a liquid?

Which of the following best describes this organism?

Barnacles are anchored to rock in the intertidal zone and do not move from this location once they are adults. Therefore, they are

In this food chain the mouse is a(n)

Which of the following organisms is mismatched with its trophic level?

If there were an additional trophic level that consisted of organisms that prey on snakes, about how much energy would be available to organisms at that trophic level?    

Chloroplasts most likely evolved from _____________.

__________ include all organisms (algae, animals, and bacteria) that drift with ocean currents.