How can biotic and abiotic factors in an ecosystem affect populations? i need 2 examples of each pls

Abiotic factors are all of the non-living things in an ecosystem. Both biotic and abiotic factors are related to each other in an ecosystem, and if one factor is changed or removed, it can affect the entire ecosystem. Abiotic factors are especially important because they directly affect how organisms survive.

b. the carbon cycle ensures living things have a source of hydrogen