tpo 11 begging by nestlings - 英檢

Answer choices
○1. Songbird species that are especially vulnerable to predators have evolved ways of
reducing the dangers associated with begging calls.
○2. Songbird parents focus their feeding effort on the nestlings that beg loudest for food.
○3. It is genetically disadvantageous for nestlings to behave as if they are really hungry when
they are not really hungry.
○4. The begging calls of songbird nestlings provide a good example of overly damaging cost to
signalers of signaling.
○5. The success with which songbird nestlings communicate their hunger to their parents is
dependent on the frequencies of the nestlings' begging calls.
○6. Songbird nestlings have evolved several different ways to communicate the intensity of
their hunger to their parents.

答案是123

但我選124

請問為何不是四而是三呢???

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