Too many in the water make aquatic plants grow so much that when they die, their decomposition causes the death of animal life from lack of oxygen. Sedimentation

Nutrients

Toxic/Hazardous chemicals

Microorganisms

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this