why might some kinds of living things undergo sexual reproduction at times when conditions in their environment become less favorable?

The ANSWER is:

Assuming ur doing SOS:

In organisms that most often reproduce asexually, the product of sexual reproduction is often more resistant to unfavorable environmental conditions than the individual of the species produced by mitosis. Some kinds of protists such as protozoans and algae do not usually reproduce sexually unless growing conditions have become unfavorable. Many plants do not produce seeds until the approach of winter or a dry period of the year.

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