The external intercostals elevate the rib cage during .

A. neither inspiration nor expiration
B. inspirationexpiration
C. both expiration and inspiration

The external intercostals elevate the rib cage during inspiration.

The respiratory muscles have a mechanical function, that of expanding the rib cage to favor the entry of air.

The external intercostals are occupying the intercostal spaces and are oriented downwards and backwards, leaving the last part of the intercostal space free.

Therefore, we can conclude that the external intercostals elevate the rib cage during inspiration.

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Inspiration is your answer.

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a

explanation:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.