Yes sweet potatoes contain sugar
Nitrogen doesn't contain air, but the air contains Nitrogen.
Yes, soil does contain nitrogen.
Yes, potatoes do contain about 1% calcium.
Yes. All living things contain nitrogen.
Nitrogen is an element that is present in proteins but not in carbohydrates. This is because proteins are made up of amino acids, which contain nitrogen atoms in their chemical structure.
Protiens contain nitrogen
No. Carbon and nitrogen are both elements. They contain only themselves.
There are many compounds that don't contain nitrogen: CO2, NaCl, H2O, C6H6, CuCl2...
Amines contain nitrogen.
Lipids haven't nitrogen.
Potatoes contain carbohydrates, which gives energy.