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If a researcher was denied permission to conduct a study because participants might suffer harm,that decision would have been made by the
Invertebrates
Animals that lack a vertebral column, including species such as insects, crustaceans, and mollusks.
Decomposers
Organisms, such as bacteria and fungi, that break down dead or decaying organic matter, recycling nutrients back into the ecosystem.
Low Oxygen
Conditions where the level of oxygen in an environment is below the necessary threshold to support most life forms.
Plankton
Small and often microscopic organisms that drift or float in water, forming the base of aquatic food webs.
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