Single-celled organisms that are abundant in even extreme environments and that do not require a host cell to reproduce are called ____.

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Bacteria are single-celled organisms that are found in a wide range of environments and can reproduce independently without the need for a host cell. Carcinogens are substances that can cause cancer, mutagens are substances that can cause mutations in DNA, parasitic worms require a host to complete their life cycle, and viruses require a host cell to reproduce.

Single-Celled Organisms That Are Abundant in Even Extreme Environments and That