What are the 3 body systems that process the molecules from the food we eat and the air we breathe?

respiratory, digestive and circulatory system

Explanation:

the respiratory system brings oxygen into the lungs when you breathe. the digestive system breaks food down into nutrients such as glucose. the circulatory system transports glucose and other nutrients from the digestive system to the cells.

precipitation

explanation:

when it goes from cloud to rain/back to earth in the form of rain

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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