Precipitation falls, plants take water from soil, animals drink water, waste returns water to ecosystem, water evaporates, condensation takes place in clouds. This describes the ______.

Which processes would be considered to be part of the carbon dioxide-oxygen cycle?

What percentage of the atmosphere is made of nitrogen?

Which plants have bacteria in their roots that assist with converting nitrogen?

If a volcano erupts and covers the land with lava that hardens, which situation occurred?

Which form of succession leaves no soil on the surface?

If a forest fire wiped out trees, which type of succession will occur?

The species that influences the survival of many other species is the ______.

This species no longer exists.

A species that has gone to near extinction is known as ______.

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