Which characteristic describes the troposphere? A)contains the ozone layer
B)has the highest air pressure
C)spans 12-50 km above Earth
D)is a good place for planes to fly

It is B)has the highest air pressure

Explanation:

c, a, and d is talking about the straosphere same as a plus plane usally flies above the troposphere cause the altituide is more calmer.

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.