Answer:
B
Explanation:
soil being depleted to nitrogen due to high runoff
The algae increase the autotrophy by offering photosynthesis to the fungi in the lichen organism.
A lichen is an organism consisting of a symbiotic association between a fungus (the mycobiont) and algae. The mushroom brings water and mineral salts. The alga produces, by photosynthesis, various organic compounds of which it gives a part to the mushroom.
autotroph would mean to self feed or you are are capable of feeding yourself
