Why does having a genetically diverse population make a species more likely to survive a change to the enviroment?

having a genetically diverse population make a species more likely to survive a change to the enviroment because random mutations can occur in a species and if a sudden change in the environment were to occur like extreme heat for example, some of the mutations in their DNA may help them survive this extreme heat and the species will be more likely to survive

a chair, a bed, and a toothbrush

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i was told this before by a teacher, so yeah

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

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