Answer:
B. Constants
Explanation:
Constants are the factors that stay the same throughout the entire experiment no matter which group. The definition of a constant is "a situation or state of affairs that does not change." this furthers the point that constant is the correct answer because they don't change in the experiment.
Answer:
C
Explanation:
through captive breeding. Once they are breed, they should be released
C - Angiosperms
Hope that helps! :)
a. respiration of living organisms
D. absorption of CO2 from the atmosphere by ocean water
