Can you show us the picture or sum
It makes up an ecosystem and the surroundings
I think it is A and D (at least those are the ones that made the most sence to me).
In this scenario, E.coli is living in our intestines, which means we are providing them with a place to live and nutrients to survive. It is also stated that they help us break down some foods.
so as you can see, we benefit them, and they benefit us.
Based on this, after defining all of your options, you will find your answer.
