I’m not sure sorry! But hope someone answers!
Answer:
Intraspecific interactions, where they are the same species, or interspecific interactions, where they are from different species.
We now know that they have unique physical, chemical, and genetic traits that set them apart from plants and other eukaryotes. For example, the cell walls of fungi are made of chitin, not cellulose. Also, fungi absorb nutrients from other organisms, whereas plants make their own food.