Which Era did mammals and birds first appear in?

Which Era did the first amphbians appear in?

Which Era did human first aappear in?

________ are the preserved remains or traces of an organism that lived in the past usually more than 10,000 years ago.

A ___________ fossil forms when sediments bury an organism and the sediments cange to rock; the organism decays leaving a cavity in the shape of the organism.

A _____________fossil forms when a mold is filled with sand or mud that hardens into the shape of the organism.

A_____________ fossil forms when minerals soak into te burried remaiins,replacing the remains,and changing them into rock.

A _____________ fossiil forms whe n organisms or parts, like leaves,stems,flowers,fish,are presssed between layers of soft mud or clay that hsrden, squeezing almost all of the organism away.

The age of one object compared to the age of another object is called?

Which law states that each rock layer is older than the one above it?

These types of fossils can be used to determine the relative age of rock layers. What are these fossils ccalled?

Eras are divided into_________.

Periods are divided in to ____?

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