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dna is composed of repeating structural units
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is the five-carbon sugar found in
dna.

DNA is composed of repeating structural units  called nucleotides.

Deoxyribose is the five-carbon sugar found in  DNA.

Explanation:

Each DNA (deoxyribo nucleic acid) molecule has two strands and they are made up of monomers called nucleotides. The nucleotide in DNA contains a phosphate group attached to a five-carbon deoxyribose sugar molecule and one of the four nitrogenous bases: adenine, guanine, cytosine and thymine. DNA has a phosphate-sugar backbone from which the nitrogenous bases project. This backbone is made by the nucleotides that are combined together by covalent bonds between the sugar of one nucleotide and the phosphate of the next. The two strands are held together by hydrogen bonds between the base pairs (adenine bonds only with thymine and cytosine with guanine) to form a double helix structure.

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.