What do you mean by extinct species?
what could be the reason cuz of which they got extinct?

Extinctions happen when a species dies out from cataclysmic events, evolutionary problems, or human interference. ... Humans also cause other species to become extinct by hunting, overharvesting, introducing invasive species to the wild, polluting, and changing wetlands and forests to croplands and urban areas.

Explanation:

Hope it helps_-_

Extinction of a particular animal or plant species occurs when there are no more individuals of that species alive anywhere in the world; The species has died out.This is a natural part of evolution.

Explanation:

Extinctions happen when a species dies out from cataclysmic events, evolutionary problems or human interference. Humans also cause other species to become extinct by hunting, over harvesting, introducing invasive species to the wild, polluting, and changing wetlands and forests to croplands and urban areas.

a because they still enjoy the fire.

explanation:

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.