Other animals unlike anything living, so probably went extinct. Paleozoic Era lasted 322 million years, divided into 6 periods a. Cambrian explosion had all present day phyla. Lots of evolution possibly because enough O2. Except for chordates, most phyla haven t changed much.
Burgess shale has important Cambrian fossils.
Warm climate, Most land covered First land plants had vascular tissue and spores, like ferns. Energy from detritus, decaying plant matter. Jaws evolved, could chew and bite. Wingless insects appeared. Glaciers, inland seas e.