Which statement is true about the levels of organization in the human body?

• A. Organs are composed of a single type of tissue.
• B. Tissues are composed of multiple organ systems.
• C. Organ systems are the smallest level of organization.
• D. Cells are the smallest unit of life and form tissues.

Answer: (D)

Verified step by step guidance

1. Understand the levels of organization in the human body: cells, tissues, organs, organ systems, and the organism.
2. Recognize that cells are the basic unit of life and the smallest level of organization in the human body.
3. Identify that tissues are groups of similar cells working together to perform a specific function.
4. Acknowledge that organs are composed of multiple types of tissues working together to perform complex functions.
5. Realize that organ systems are composed of multiple organs that work together to perform major functions or meet physiological needs of the body.