Which one is true?
A. symbiosis when neither population affects each other
B. symbiosis when the interaction is useful to both the populations
C. commensalism when none of the interacting populations affect each other
D. commensalism when the interaction is useful to both the populations
Answer: Option B
I was preparing for the test from 5pm until 10pm yesterday.
Or
I prepared for the test from 5pm until 10 pm yesterday.