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Gases in the Atmosphere

Chapter 5:1
Across
When animals and people breath in air their bodies use_______.
What you do when you breathe in?
_______ is surrounded by the atmosphere.
The process plants use to make their own food.
All ________ things need oxygen and nitrogen.
The layer of gases that surrounds the earth is called the __________?
Down
What is at the top of the list that you need to live?
When animals and people breathe out they release ____________.
All living things need __________.
What you do when you breathe out?