A regular pattern of change is called a

I am a time of new growth and living things... what season am I?

How do we classify seasons when there are only two?

Plants release _ into the air

Animals and people breathe out __ during respiration

I have cooler temperatures and living things prepare for survival... what season am I?

Explain photosynthesis

What is nitrogen, and why is it important?

What must happen to nitrogen before it is usable by plants, animals, and people?

When the sun warms the earth and its waters, some of the water changes from liquid water to water vapor. This is called___.

Plants release water vapor into the air through____.

The process of water vapor changing into a liquid is called___.

Explain ground water.

Plants and animals that originally live in an ecosystem

A population so small that it is in danger of becoming extinct

A species whose last known member has died

Plants and animals that are not native to an area and can cause harm

I do not have a definite beginning or ending... what natural disaster am I?

Any physical hazard to life caused by having too much or too little of things needed for life is called a ___.

Gradual changes in the population of organisms in an ecosystem are called ___.

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