Which time period of Earth did NOT have dinosaurs alive?

Since all three structures are similar, but different, these organisms have what in common?

Charles Darwin's key principle that organisms in a group will be different genetically

In which time period are we currently living?

Q. 

In what time period did Pangaea, the super continent, appear?

What are fossils that are abundant, easily recognizable, short lived, and widespread called?

The Law of Superposition states

Which era was the longest, taking up 88% of geologic time?

Darwin collected most of his observations at which islands?

Which fossil would make the best index fossil?

What two methods are used for determining the age of rocks and fossils?

Use relative age dating to put the rock layers in correct order from oldest to youngest.

Occurs when all members of a species have died.

a scientist who studies fossils

change in living things over time

a trait that increases an organism's ability to survive and reproduce

What is the process by which organisms that inherit advantageous traits tend to reproduce more successfully than other organisms do?