Which of these is a response to an internal stimulus?
A. A sunflower turns to face the rising sun.
B. A cucumber tendril wraps around a wire.
C. A pine tree knocked sideways in a landslide grows upward in a bend.
D. Guard cells of a tomato plant leaf close when there is little water in the roots.
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Which of these is a response to an internal stimulus?
A. A sunflower turns to face the rising sun.<...
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