Answer:
Cell
Explanation:
A cell is the smallest unit of a living thing.
Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
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➷ It would be D. 25 degrees. This is because there was the highest oxygen flow at this temperature meaning that the rate of photosynthesis was higher.
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A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
