Question

question 31
the epithelium of parietal pleura of the lung is simple, which means:
○ not hard.
○ not complicated.
○ one layer.
○ more than one layer.
question 32
what is the purpose of the arm in a microscope?
○ a person holds the arm when moving the microscope.
○ light passes through the arm before reaching the objective
○ the adjustment knobs are located on the arm
○ the illuminator is located on the arm.

Explanation:

For Question 31: In biological terminology, "simple" when describing epithelium specifically refers to a single layer of cells.
For Question 32: The arm of a microscope serves as a structural handle for safely moving the instrument; light paths, adjustment knobs, and illuminators are not associated with its core purpose.

Answer:

Question 31: One layer.
Question 32: A person holds the arm when moving the microscope.