What is the basic unit of an organism?

• A. Tissue
• B. Cell
• C. Organ system
• D. Organ

Answer: (B)

Verified step by step guidance

1. Begin by understanding the hierarchy of biological organization. Organisms are composed of various levels of structural complexity, starting from the smallest unit.
2. Recognize that the cell is the fundamental unit of life. It is the smallest structure capable of performing all the functions necessary for life.
3. Differentiate between the terms: tissue, organ, and organ system. Tissues are groups of similar cells that perform a specific function. Organs are made up of tissues and perform complex functions. Organ systems are groups of organs that work together to perform vital functions.
4. Identify that cells are the building blocks of tissues, organs, and organ systems. Without cells, these higher levels of organization cannot exist.
5. Conclude that the basic unit of an organism is the cell, as it is the smallest unit that can carry out life processes independently.