Paleontologist use _______________ to estimate the age of a fossil based on the layer in which it is found.

Dinosaurs dominated the Earth during the _______________, some 200 million years ago.

Some important divisions of geologic time are marked by______________.

The first primate ancestors, called ___________, appeared during the Cenozoic era.

Although _____________ had thicker and heavier bones than present-day humans, they appear to be our closest ancestors.

Cyanobacteria, which first appeared on Earth over 3 billion years ago, are

Which of the following is characteristic of ALL primates?

Which of the following is characteristic of ALL primates?

Which group of hominids that lived in Europe and Asia disappeared form the fossil record about 30,000 years ago?

Past mass extinctions most likely occured as a result of ________.

The first organisms to appear on Earth were

Which occurred first in hominid evolution, an enlarged brain or the ability to walk upright?

Plants and air-breathing animals appeared during this time period.

Most ancient hominids are called ____________.

The Age of Mammals refers to the _______________.

The Age of Reptiles refers to the ______________.

How old do scientist estimate the age of the Earth to be?

An ape is a hominid.

Traces or imprints of living things preserved in rock are called __________.

The amount of time it takes for half of the unstable atoms in an element to decay is called the _________.

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