Early forms of live appeared (simple, single cells)
Prokaryotes diversify, photosynthesis brings oxygen into the air (stromatolites)
Eukaryotes appear, soft-bodied animals / plants in the sea

Animals with skeletons, trilobites are common....Cambrian explosion leads to most modern animal groups

Jawless fish appearing, rich variety of marine invertebrate life, first chordate animals; plants spores

Simple plants and scorpions on land, jawed fish, ammonites in sea, earliest plants with conducting tissues

Land vertebrates, fish and simple land plants diversify, club mosses

Reptiles diversify, cone - bearing plants. trilobites and many invertebrates became extinct

First flowering-plants, end of period dinosaurs and ammonites and other groups became extinct

Humans appearing and expanding their range, ice ages making largest mammals extinct in North