Which of these is an organism?
herd of sheep
wolf
drop of water
heart

singular it is a wolf plural it is herd of sheep

but both are correct

wolf

Explanation:

An organism is an individual animal, plant, or single-celled life form.

The herd of sheep is more than one so that's cancelled out.  A drop of water is not a plant, animal, or alive so that's cancelled out.   A heart can beat but it's the human's body as a whole that lives and runs so that's canceled out.  Leaving the only option 'wolf' to fit the criteria of being an organism.

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answer; the above answer to the above statement is (true)