Final answer:
Cells are the basic unit of life and perform all functions in organisms. Organs are anatomically distinct structures composed of tissues that perform specific physiological functions. Organelles within a cell perform similar functions to organs in an organism.
Step-by-step explanation:
Cells are the basic unit of life and perform all functions of life in organisms. Tissues are groups of similar cells that work together to perform a specific function. Organs are anatomically distinct structures composed of two or more tissue types, and each organ performs specific physiological functions. Organ systems are groups of organs that work together to meet the physiological needs of the body.
Within a cell, organelles are the structures that perform functions. For example, the Golgi apparatus is responsible for processing and packaging proteins, while the nucleus contains genetic material and controls cellular activities. These organelles perform similar functions to organs within an organism.