Answer:
mutualism
Explanation:
It's a symbiotic relationship beneficial to both symbionts.
in this case E. Coli helps with the absorption of Vitamin K and other important vitamins for the human body in the colon. While, Human (host) provides shelter for it
Both auxin and cytokinin are used to increase size of stem and fruits
The answer will definitely be B) Compound Light Microscope because other cells can die from the other microscope, and their to powerful, so they can't handle it.