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Magma is molten rock exposed on the Earth’s surface.

In between vascular and gymnosperm plants, an intermediate evolutionary step called ____________ was necessary.

Organisms with an evolutionary advantage are those that:

Put the following organisms in order of evolution, from earliest to latest.​

Basement rocks are made up of:

The two types of Earth’s crust are continental and lithospheric.

The fossil record shows significant changes in the diversity of organisms through time.

Any vertebrate (such as amphibians and reptiles) that depends on external heat to regulate body temperature is said to be ____.​

From the oldest to the youngest, what are the three phases of the Cordilleran orogeny?

Most of the organisms that have ever existed are now extinct.