Yes because the anteaters without the long snout would not be able to reach the ants to get the nutrients and die off unlike the anteater with the long snout
It would be C because hair and feathers and what not are made from the protein keratin.
C. The Roots and Mycelium
Both are the best similar structures between plants and fungi as these parts serves as the channels which transports all the nutrients from the soil/host to the plant/fungi.
Organ system is the answer