second-longest division; marked by significant world wide changes in types of fossils present in rock
characterized by differences in life forms, but differences can be regional rather than global
longest subdivision; based on an abundance of fossils
based on types of life existing worldwide at a particular time
longest part of Earth's history, lasting from 4.0 billion to about 544 million years ago
amphibians, reptiles and ferns evolved
dinosaurs, birds, and flowering plants appeared
humans and large mammals appeared
worms and jellyfish appeared
the most recent period in Mesozoic Era
oldest period in Mesozoic Era
most recent period in Cenozoic
this dinosaur built nests in which it laid eggs and raised its offspring
earliest bird, had wings and feathers; had features no shared with modern birds
fast running animal; could reach speeds of 65 km/h (as fast as a modern race horse
flowering plants, produce seeds with hard outer covering
are plants that produce seeds but not flowers
mammals that carry their young in a pouch
What color are cyanobacteria?
What do cyanobacteria put in the atmosphere?
have exoskeleton with 3 lobes; lived in oceans for more than 200 million years
process by which organisms that are suited to a particular environment are better able to survive and reproduce than organisms that are not
in the Paleozoic Era
When was Pangaea formed?