Which substance is a good natural resource because it is used by plants and in fertilizer, and sometimes can be used to keep things really cold? a. silicon b. oxygen c. krypton d. nitrogen

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carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.