16. dna is a polymer of which consist of a sugar, a phosphate group, and a a. amino acids; nucleotide b. nucleic acids; nucleotide c. nucleotides; nitrogenous base d. nucleotides; nucleic acid e. proteins; nucleotide

The answer is nucleotides.DNA is a nucleic acid (desoxirribunocleic acid) polymer composed of units, this is monomers, named nucletoids. Nucleotids are organic molecules with several functional groups ( phosphates, OH, NH2). The monomers bond each other to form a large chain (a polymer) which is the DNA.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

carbon

explanation: