A rock with coral and shells in it would have existed in which environment originally?

During which period did the greatest mass extinction on Earth occur?

The time needed for one half of an isotope to decay.

Which of the following is NOT a division on the geologic time scale?

Uranium 238 has a half life of 4.5 billion years. If a 4g sample has decayed to 2g, what is the age of the sample?

Which of the following is NOT an advantage mammals have over reptiles?

True or false: a fault is younger than a rock it cuts through.

Dinosaurs are the ancestors of which living organism?

Humans were able to migrate from Asia to North America because...

Which of the following is NOT a reason why scientists believe animals such as wooly mammoths and saber toothed cats became extinct?

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