Question

from \space plants\ which operation involving the aph must iss crew members complete? a. increasing or decreasing light output b. changing an atmospheric filter c. adjusting the humidity d. increasing oxygen

Explanation:

Without additional context about what APH is, it's difficult to be certain. However, in the context of space - plant experiments, adjusting light output is a common operation for plant - growth systems in space.

Answer:

A. increasing or decreasing light output