What happens to a euglena when sunlight is not present

Plants would die because they need the sun for photosynthesis, to produce their energy. Plant-eating animals would die because there would then be no plants for them to eat.

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

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