AP Bio Insta-Review Topic 7.6*: Evidence of Evolution

Front

What is a half-life?

Back

The time required for half of a sample of a radioactive substance to decay.

Front

How much of a 200 g sample is remaining after 5 half-lives?

Back

6.25 g.

Front

Which fossil is the oldest?

Back

Fossil Z.

Front

What fossil layer is the oldest?

Back

The deepest layer.

Front

What type of rock are fossils found in?

Back

Sedimentary rock.

Front

How many half-lives to get to 1/32 of the original amount?

Back

5 half-lives.

Front

What is the principle of superposition in geology?

Back

In undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What is relative dating in geology?

Back

A method used to determine the age of rocks and fossils by comparing them to other rocks and fossils.

Front

What is absolute dating?

Back

A method used to determine the actual age of a rock or fossil through radiometric techniques.

Front

What is a fossil?

Back

The preserved remains or traces of ancient organisms.