AP Bio Evolution Dates
Terms in this set (15)
Anatomically modern humans evolve. Seventy thousand years later, their descendents create cave paintings — early expressions of consciousness.
In Africa, an early hominid, affectionately named "Lucy" by scientists, lives. The ice ages begin, and many large mammals go extinct.
A massive asteroid hits the Yucatan Peninsula, and ammonites and non-avian dinosaurs go extinct. Birds and mammals are among the survivors.
As the continents drift toward their present positions, the earliest flowers evolve, and dinosaurs dominate the landscape. In the sea, bony fish diversify.
Dinosaurs and mammals evolve. Pangea has begun to break apart.
Over 90% of marine life and 70% of terrestrial life go extinct during the Earth's largest mass extinction. Ammonites are among the survivors.
The supercontinent called Pangea forms. Conifer-like forests, reptiles, and synapsids (the ancestors of mammals) are common.
Four-limbed vertebrates move onto the land as seed plants and large forests appear. The Earth's oceans support vast reef systems.
Land plants evolve, drastically changing Earth's landscape and creating new habitats.
Arthropods move onto the land. Their descendants evolve into scorpions, spiders, mites, and millipedes.
Fish-like vertebrates evolve. Invertebrates, such as trilobites, crinoids, brachiopids, and cephalopods, are common in the oceans.
Multi-cellular marine organisms are common. The diverse assortment of life includes bizarre-looking animals like Wiwaxia.
Unicellular life evolves. Photosynthetic bacteria begin to release oxygen into the atmosphere.
Replicating molecules (the precursors of DNA) form.
The Earth forms and is bombarded by meteorites and comets.