Mod D Unit 1 Vocab

Front

A record of an organism's activity.

Back

Trace Fossils

Front

In _____________________________________________________ states that in a sequence of undisturbed sedimentary rocks, the oldest layers are at the bottom and the youngest ones are at the top.

Back

The Law of Superposition

Front

Collection of all known fossils in order from earliest to most recent is the _____________.

Back

Fossil Record

Front

An ________________________________ occurs when a species dies out with no members left on Earth.

Back

Extinction

Front

A __________ is an ancient species from which multiple species evolved.

Back

Common Ancestor

Front

No symmetry means ____________.

Back

Asymmetrical Symmetry

Front

Has many lines of symmetry.

Back

Radial Symmetry

Front

Process of biological change where populations differ from ancestors over generations.

Back

Evolution

Front

The __________ divides Earth’s history into intervals defined by major events.

Back

Geologic Time Scale

Front

Layer indicating age relation to others.

Back

Relative Age of Rock