What is the missing first step of the following process:  -  Once in the lungs, oxygen is moved into the bloodstream and carried through your body - At each cell in your body, oxygen is exchanged for a waste gas called carbon dioxide - Your bloodstream then carries this waste gas back to the lungs where it is removed from the blood stream and then exhaled - Your lungs and respiratory system automatically perform this vital process, called gas exchange -
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Answer: He air we breathe contains oxygen and other gases


What is the missing first step of the following process:  -  The water is boiled to a very high tempature - The salt becomes seperated from the water - The salt is removed - The water is able to be drank at this point.
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Answer: Salt water is contained in a factory or plant


What is the missing first step of the following process:  -  The matter forms on the sea floor - Layers of sediment form above the matter compressing it - After many years the matter is compressed and heated - The result is that crude oil forms.
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Answer:
Living organisms in the sea die