turtles in ponds(1).png Which pond has the higher relative abundance?

keystone species.png  Use the graph to answer the following question: What does the graph tell you about the effect of a keystone species?

nitrogen cycle.png Use the figure to answer the question. Consider the global nitrogen cycle depicted in the figure. What is the limiting portion of the cycle for plants?

________use chemicals from the environment (like deep-sea vents) to make their food.

An incremental lowering of standards that results with each new generation lacking knowledge/observation of the historical (or previous) condition of the environment being observed describes:

__________________ is a process in angiosperm plants in which two sperm are required to fertilize the contents of the embryo sac.

Which of the two body forms found in cnidaria is the dominant part of the hydra life cycle?

What do tapeworms use to attach to their host?

Which Supergroup consists of mostly unicellular, non-photosynthetic organisms with shells (or skeletons) have tubular cristae in their mitochondria, and make up the majority of the protozoan fossils? (example: Radiolarians)

Darwin proposed that natural selection occurs in an environment by