The earth's atmosphere contains trace gases, some of which absorb heat. These gases (water vapor, carbon dioxide, methane, ozone, and nitrous oxide) are referred to as "greenhouse gases." these type of gases works as a glass
what 2 kind parts
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the 3 end parts of digestion,,,,,,,
there are three basic things which are digested in the human body. they are proteins, fats and carbohydrates. although there are many other complex substances these are the main basic things which are digested in the body and they arel all important for the growth and development of a normal human. 

sry it it is the answer of another question