How does biodiversity affect the stability of an ecosystem?

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .

In which of the following relationships is one organism always benefited while the other organism is always harmed

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.