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Oxygen (O2) is released into the atmosphere through a metabolic process between water and carbon dioxide, called: 

Covalent bonds occur when electron shells of adjacent atoms overlap and become shared.

Most modern land plants are vascular plants that have a complex network and tissue system for transporting water and nutrients.

________ plants, that thrive in moist areas, are those with no specialized cells for water or nutrient transport.

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.