Euglena, amoeba, paramecium, and volvox are all single-celled organisms that carry out the basic functions of life. They are typically found in freshwater habitats. While they are simple compared to other organisms, they can possess unique features. Which single-celled organism has an eye spot? A. paramecium
B. volvox
с. amoeba
D euglena

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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

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.