Water always flows down a water slide. the harder a ball is hit, the faster it will travel. small birds use less energy to fly as fast as big birds. the statements above are examples of a) hypotheses. b) scientific laws. c) unproven theories. d) research problems.

Competition. interaction among organisms that compete for the same natural resource (food, shelter, water, space) in an ecosystem. predation. an interaction in which one organism kills another for food. predator. prey. symbiosis. mutualisum. commensalisum. parasitisum.

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