Dwarf mistletoe grows on many pine trees in the Rockies. Although the mistletoe is green, it is probably not sufficiently active in photosynthesis to produce all the sugar it needs. The mistletoe also produces haustoria. Thus, dwarf mistletoe growing on pine trees is best classified as
A) an epiphyte.
B) a nitrogen-fixing plant.
C) a carnivorous plant.
D) a symbiotic plant.
E) a parasite.
