Tissues are groups of similar __________ that have a common function.

• A. cells
• B. organs
• C. atoms
• D. organelles

Answer: (A)

Verified step by step guidance

1. Begin by understanding the basic hierarchy of biological organization. Atoms form molecules, molecules form organelles, organelles form cells, cells form tissues, tissues form organs, organs form organ systems, and organ systems form organisms.
2. Identify the definition of a tissue in anatomy and physiology. A tissue is a group of similar cells that work together to perform a specific function.
3. Consider the options provided: cells, organs, atoms, and organelles. Evaluate which of these options logically fits the definition of a tissue.
4. Recall that cells are the building blocks of tissues. Tissues are composed of similar cells that have a common function, such as muscle tissue or nervous tissue.
5. Conclude that the correct answer is 'cells' because tissues are groups of similar cells that have a common function.