Refer to the Figure

question 2

Multiple Choice

Refer to the figure.
Calls at higher frequencies do not travel as far as calls at lower frequencies. This suggests that the begging frequencies of ground-nesting warblers are

• A) an adaptation to evade eavesdropping by predators due to their higher nest exposure.
• B) non-adaptive per se, but the by-product of another adaptive trait.
• C) an honest signal that communicates the chick's health to its parents.
• D) an adaptation that evolved in an ancestor of both tree and ground nesting warblers.

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