Why do hummingbirds emigrate from this population of scarlet gilia?
A) The flowers change from red to white, and the hummingbirds can't see them.
B) It gets darker on the mountainside, and the hummingbirds migrate to lower elevations where it stays light longer.
C) The flowers probably change their nectar production.
D) There is not enough information presented to answer this question.
Correct Answer:
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