C. Mistletoe is a species of plant that grows into the tissue of some tree species and uses the tree as a source for its nutrients. The tree can be harmed by an overgrowth of mistletoe in its branches
Explanation:
Parasitism is a relationship between two species in which one organism, the parasite, lives off the other, the host. This describes a mistletoe growing into the tissue of some tree species and uses the tree as a source of its nutrients. Notice how the answer choice mentions harm being doing to the host. This is common in parasitic relationships. Also, A describes commensalism, B describes mutualism, and D describes competition.
