Era in which multicellular organisms evolved (540 million years ago)
demonstrated that organic compounds could be made by simulating conditions on early Earth
one organisms lives within body of another, and both benefit
geologic time scale
representation of the history of Earth
"Age of dinosaurs"
organic molecules may have arrived on Earth through meteorite or asteroid impacts
category of mammals with flexible hands and feet, forward
looking eyes, and enlarged brains relative to body size.
organisms that existed only during specific spans of time over
large geographic area
minerals carried by water are deposited around or replace the
two legged or upright walking led to evolutionary success
"Age of mammals"
Iron-sulfide bubbles hypothesis
biological molecules formed in chimneys of hydrothermal vents
technique using natural decay rate of unstable isotopes to
measure age of fossil
estimate of date by comparing placement of fossils in rock layers.