Question

question 9
1 pts
which of the following is not a characteristic of a respiratory surface?
single layer of cells
large surface area
moist
all of these are characteristics of a respiratory surface

Explanation:

A respiratory surface needs to facilitate gas exchange. A single - layer of cells (for easy diffusion), a large surface area (to increase the amount of gas exchange), and being moist (since gases dissolve in moisture for diffusion) are all essential characteristics.

Answer:

all of these are characteristics of a respiratory surface