Question

Justify why organisms like the paramecium, that is a unicellular organism, can survive without complex organ systems. What do they used instead? Explain

Answer 1

As the single cell performs all required functions and thus these organisms need structures to perform their body functions. In contrast, multicellular species are composed of more than one cell and have complex machinery to sustain life.

Cells function differently in unicellular and multicellular organisms. 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.