All of the big 5 extinctions occurred during the?

Phanerozoic Eon. Hope this helps

There is sand and mud

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you