Answer:
D mutualism
Step-by-step explanation:
The question states the definition of Mutualism (both benefit), and not Commensalism (two organisms in which one species benefits and no effect is apparent to the other species) or parasitism or predator-prey situation.
and, graded as correct in ody ssey ware biology specifically
The WAY this question is worded can be tricky. ".... from their relationship of actually being the lichen itself..." No Lichen talk in the course material, which is what most of this software's questions are based on. did not state that a lichen IS the combo of the algae & fungus.
also not in course material this test is based on: Lichens are a complex life form that is a symbiotic partnership of two separate organisms, a fungus and an alga. The dominant partner is the fungus, which gives the lichen the majority of its characteristics, from its thallus shape to its fruiting bodies. ... Many lichens will have both types of algae.
Meaning. If you don't know what a Lichen is, then Commensalism : a symbiotic relationship between two organisms (algae & fungus) in which one species ( the third party lichen that the algae and fungus are IN ) benefits and no effect is apparent to the other species ( algae & fungus )
would have seemed like an option.