Question

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if a drought reduces water availability in a forest ecosystem, which levels of biological organization would be most directly affected, and why?
o atoms and molecules, because water stops existing during a drought.
o the biosphere as a whole, because one forest controls the entire planet.
o cells and organ - systems, because drought makes them disappear completely.
o organisms and populations, because living things need water to survive and reproduce.

Explanation:

Water is essential for the survival and reproduction of living organisms. A drought reducing water availability in a forest ecosystem would directly impact the organisms and populations that rely on water. Atoms and molecules don't stop existing during drought, one forest doesn't control the entire biosphere, and drought doesn't make cells and organ - systems disappear completely.

Answer:

D. Organisms and populations, because living things need water to survive and reproduce.