Most covalently bonded substances consist of individual separate molecules. Each individual molecule is held together by means of strong bonds between the atoms. In addition, there are weak forces of attraction between the individual molecules, called forces.

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.

"a.) well–developed vascular system."

that scientist would be robert hooke

d we did this already