Answer:
C. Thigmotropism
Explanation:
Thigmotropism is the turning or bending of a plant or other organism in response to a touch stimulus. Answer choice A can be eliminated because its root "hydro" can give us a hint that it is related to water. Answer choice B implies that it will have something to do with gravity, due to the root "geo." Answer choice D can be eliminated because its root "photo" tells us it will be involved with light.
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The primary difference between organic vs. inorganic compounds is that organic compounds always contain carbon while most inorganic compounds do not contain carbon
I believe in the hierarchy of life the level of organ systems is above the organ level.