Explanation:
the last option is the correct answer
The disappearance of the deer indicates A. Intraspecific Competition
Yes, because there is only so much weight it can hold.
A wheelbarrow is not an example of a pully
Mostly bacillus (bacteria with cylindrical/rod shaped morphology) I'm pretty sure, you don't see any type of coccus (bacteria with spherical morphology) with flagella.