How do trees interact with other organisms?
a.
they provide other organisms with food.
b.
they receive shelter from other organisms.
c.
they obtain food from other organisms.
d.
all of the above

A tree uses photosynthesis, so unless an animal dies and provides nutrients for the tree it cannot obtain food from other organisms. It also provides its own shelter, so it's not b. The only answer left would be A. they provide other organisms with food. Food like fruit, bark, leafs, etc.

a.
They provide other organisms with food.

There would be no evaporation so no water cycle