Which of the following is a form of precipitation A: rain
B: snow
C: hail
D: all of the above

D

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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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C. a mature ovule of a plant.