Bill Nye: Fossils

Almost all the things that have ever lived on Earth are _______

When did we figure this out?

Fossils are evidence of _______ things that have turned to _______

______ of all living things that have ever been on earth are extinct.

All fossils consist of bones that have hardened into stone

The Le Brea tar pits are found in ______

Animals became trapped in the sticky tar, leaving their _______ behind

Why have you never seen a saber toothed cat?

Some of the oldest fossils are ______ years old

What used to be a tree, is now a rock, and has been _____ because its cells have been replaced with minerals

Some fossils were created when _____ were left in wet mud or sap.

Measuring the distance between footprints can tell scientists how big the whole animal was.

The age of rocks can give clues to how old different fossils are.

Fossils are usually found in _______ rock that is usually laid down in _______.

_________ are the traces or remains of ancient life

Fossils can be used to show how ancient animals might have looked when they were alive.

Archaeopteryx means what

Dinosaurs and birds are related

_________ have the same chemical composition as _________

Are fossils being made even today?