Chapter 4 Science Test Review

__________________ two or more living things in an ecosystem using the same limited resources

__________________ an organism that lives on or in another organism, helping itself but hurting the other organism

__________________ an organism that is harmed by a parasite

__________________ a gradual change from one community of organisms to another

__________________ no longer living, as an entire species or no longer active, as a volcano

__________________ a species whose population has been reduced to such small numbers that it is in danger of becoming extinct

__________________ substances that are very harmful to humans and other organisms

Why do chipmunks in the Great Smoky Mountains survive?

Which describes a balanced ecosystem?

A meadow has too many rabbits. What would help balance this ecosystem?