From cellular point of view, how are Amoeba and earthworm different from each other?

From a cellular perspective, Amoeba and earthworms represent fundamentally different levels of biological organization. Amoeba is a unicellular organism, meaning its entire body consists of just a single cell that performs all life functions—nutrition, respiration, excretion, and reproduction—independently. In contrast, an earthworm is a multicellular organism composed of millions of specialized cells organized into distinct tissues and organ systems, where different groups of cells perform specific functions like digestion, circulation, and locomotion.

This difference reflects the evolutionary advancement from simple, single-celled life forms to complex, multicellular organisms. While the single Amoeba cell must be a jack-of-all-trades, handling every biological process within its cytoplasm and organelles, the earthworm's cells have undergone differentiation, becoming specialized for particular roles. This cellular specialization in multicellular organisms allows for greater efficiency and complexity in body functions, enabling earthworms to develop structured organ systems like the digestive tract, nervous system, and circulatory system that would be impossible in a single-celled organism.