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The respiratory system includes a layer of cells in the air passages that clean the air before it gets to the lungs. This layer of cells is best classified as _______.(1) an organ system(2) an organ (3) an organelle(4) a tissue

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Answer: 4) a tissue

Explanation:

When a group of cells come together to perform a specified function, they are referred to as tissue. When a group of tissues come together to perform a specified function, they become an organ. If a group of organs, come together to perform a specific function, they are referred to as a System.

Answer:

The correct answer is (4).

Explanation: