A maple tree's seeds occur in pairs that are enclosed and attached to flat "wings" that are made of a papery tissue. The wings' shape allows them to spin in the air as they fall from the tree; this unusual motion has earned them the nickname "helicopter

seeds." Maple tree seeds are most successful when they are dispersed by

A) wind.
B) water.
C) mammals.
D) birds.


Answer: A

Biology & Microbiology

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Fill in the blank with correct word.

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