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Biology 20 Online
OpenStudy (anonymous):

30. A student plants a bean seed in a pot. After several days, the student observes a small root growing out of the seed. The root is growing downward towards the bottom of the pot. This is an example of (1 point) gravitropism. photoperiodism. phototropism. thigmotropism.

OpenStudy (anonymous):

I think it's photoperiodism

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