Question

fill in the blank question
the flattened wings of penguins that are suited for an aquatic lifestyle are an example of a(n)
to a specific environment.

Explanation:

In biology, an adaptation is a trait that helps an organism survive and reproduce in its environment. Penguin wings being flattened to suit an aquatic lifestyle is a structural adaptation that aids in swimming, so the term here is "adaptation".

Answer:

adaptation