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A strand of DNA is a polymer of Choose... joins by covalent bonds between the Choose... of one monomer and the Choose...of the next monomer

A strand ... = nucleotides or nitrogenous bases ?

Joins by covalent ... = deoxyribose, thymine, adenine, or guanine

Of one monomer.. = phosphate group or nitrogenous base

A strand of DNA is a polymer of nucleotides joined by covalent bonds between the deoxyribose of one monomer and the phosphate group of the next monomer.

DNA is the polymer of the nucleotides. In the DNA Nucleotides are bonded by phosphodiester bonds.

Therefore, a strand of DNA is a polymer of nucleotides joined by covalent bonds between the deoxyribose of one monomer and the phosphate group of the next monomer.

To know more about Nucleotides, refer to the link:

link

A strand of DNA is a polymer of nucleotides joins by covalent bonds between the deoxyribose of one monomer and the phosphate group of the next monomer.

Explanation: Nucleotides are the building blocks or monomeric units of DNA. Nucleotides have three components: A nitrogenous base, a pentose and a phosphate group. Nucleotides have two kinds of pentoses: deoxyribose and ribose but only deoxyribose is found in DNA. The nitrogenous bases are derivatives of two parent compounds pyrimidine and purine. The two major purine bases are adenine and guanine while the pyrimidine found in DNA are cytosine and thymine. The successive nucleotides of DNA are covalently linked through phosphate group bridges in which the 3'-hydroxyl group of one nucleotide unit is joined to the 5'-phosphate group of the next nucleotide by a phosphodiester linkage.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.