What happens when a fungus- like protists lives and feeds off of a tree

Slime molds are fungus-like protists that grow as slimy masses on decaying matter. They are commonly found on items such as rotting logs. This was all I could find in the library, hope this helps.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?