What might be the evolutionary significance of the switch from asexual to sexual reproduction that occurs in some species when the environment becomes unfavorable

Explanation:

The evolutionary significance  of the switch from asexual to sexual mode of reproduction in some species under unfavorable environmental conditions is because of the need of More mutations and variations can be made in the species. The asexual mode causes the making the same copy so when there needs to be change.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.

the answer to you question is   jet streams