Question

a structure that is composed of two or more tissue types that work together to perform specific functions for the body is a(n) ______.
complex cell
organ
organ system
complex tissue

Explanation:

To solve this, we recall the biological organizational levels: Cells make up tissues. Tissues (two or more types) working together form an organ. An organ system is multiple organs working together. A complex cell is not the term for this structure, and complex tissue is still a tissue (not multiple tissue types working for a function). So the correct term is "organ".

Answer:

B. organ