Answer:
The answer is C, Species A is a predator and species B is its prey.
Explanation:
I found a random PDF earlier that has all the answers to like a hundred ecology questions and this was one of them.
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Answer:
To view prokaryotes with the compound microscope, you must use an oil-immersion lens (100x objective).
Well, if it's an environmental community: Erosion changes the shape of the landscape. New plants grow in, small streams may form. New creatures moving in may also shape the community over time.
In a civilized community: New people in power, of course. Also, new people moving in and out. Hope I helped!