Which of the following best describes the difference between the levels of organization in the human body?

• A. Tissues are composed of multiple organs working together.
• B. Cells are the smallest unit of life, while tissues are groups of similar cells performing a common function.
• C. Organ systems are the smallest unit of life, while cells are groups of similar tissues.
• D. Organs are composed of multiple organ systems working together.

Answer: (B)

Verified step by step guidance

1. Begin by understanding the hierarchy of biological organization in the human body, which progresses from the simplest to the most complex structures.
2. Recognize that cells are the fundamental building blocks of life, representing the smallest unit capable of performing life functions.
3. Identify that tissues are composed of groups of similar cells that work together to perform a specific function, such as muscle tissue or nervous tissue.
4. Understand that organs are structures made up of different types of tissues that work together to perform complex functions, like the heart or liver.
5. Finally, realize that organ systems consist of multiple organs that collaborate to carry out broader physiological functions, such as the digestive system or respiratory system.