Fossil sponges are among the oldest known animal fossils. true or false

This is true. There is debate as to from what period have the currently examined sponges come, but the common consensus is that they go all the way to the Precambrian period, some 600 million years ago. They gave way to many discoveries about evolution of organisms because it was the first organism to have some genes that are found in modern day organisms.

True. Fossil sponges are amongst the oldest known animal fossil.