Answer:
All living things can sense and respond to stimuli in their environment. Stimuli might include temperature, light, or gravity. All living things grow and reproduce. Multicellular organisms grow by increasing in cell size and number. Prokaryotes are organisms whose cells lack a nucleus and other organelles. Prokaryotic cells are surrounded by a plasma membrane, but they have no internal membrane-bound organelles within their cytoplasm. Multicellular organisms are larger, more efficient, and have a longer lifespan than unicellular organisms. Multicellular organisms need more resources than unicellular organisms. The cells are specialized and must depend on each other for survival of the organism. Although much smaller, unicellular organisms can perform some of the same complex activities as multicellular organisms. 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. Do unicellular organisms have specialized cells? A unicellular organism depends upon just one cell for all of its functions while a multicellular organism has cells specialized to perform different functions that collectively support the organism. I hope this helps explain.