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Many unicellular organisms live in extreme environments, such as hot springs, thermal ocean vents, polar ice, and frozen tundra. These unicellular organisms are called extremophiles. Extremophiles are resistant to extremes of temperature or pH, and are specially adapted to live in places where multicellular organisms cannot survive. This unique feature allows scientists to use unicellular organisms in ways previously only imagined. When Thermus aquaticus was discovered in the boiling water of a Yellowstone Park hot spring, scientists used its special enzyme TAQ polymerase to replicate DNA billions of times in the span of just a few hours. Without this discovery, forensic science and genetic testing as we know them wouldn’t exist. Other extremophiles have been used for treating arthritis and autoimmune diseases, making paper, treating waste, and radiation resistance.
However, not all unicellular organisms are extremophiles. Many types live under the same narrow range of living conditions as multicellular organisms, but still produce things necessary to all life forms on Earth. For example, phytoplankton is a type of unicellular organism that lives in the ocean. Not only are they the very foundation of the ocean’s food chain, but phytoplankton also provide most of the oxygen in Earth’s atmosphere. Without them, humans could not breathe, plants could not thrive, and life would cease to exist completely.
Answer:
Yes they can appear in different parts of organisms