host plant
If you count bacteria and viruses, a virus tends to feed off bacteria.
go on a catapillar plant and bite some leaves off to eat
A Parasite
Parasite.
Fungi
If you are asking what feeds off other plants and animals, then I will tell you that an omnivore is something that feeds off plants and animals. A carnivore is something that only eats other animals. A herbivore is something that eats only plants.
it feeds off of water
Snake River
That is an animal that is called a scavenger. An example of a scavenger is a fox.
mold would be considered a decomposer. mold feeds off of dead/dying plant material and therefore, is not a producer.
No
All kinds of water needing animals will use this plant to obtain water. Birds, rodents, and humans.