Those Mushrooms Live Like a Fungus, Right?

There's a worm called the zombe worm which feeds off skeletons of, mostly whales, but other dead ocean animals at the bottom of the sea. It sends acid out on to the bone, which kind of melts it well, disolv dissolving. And then they just live inside whalebones forever and ever. I think i read that there are some sponges which have been observed feeding on fossils and the fossilized bos of ancient whales. They've gen eaten the air, i guess. Yet, i suppose if bones didn't disintegrate, we would just have just been needwe. If you look at chalk cliffs, that's all em, the skeleton asto stuff