Answer: alternative D.
Explanation: For the DNA to have the double strand structure, it is necessary to copy the sequence of the existing DNA strand in a complementary sequence of nucleotides, forming hydrogen bonds between them. The mRNA also uses this strategy when reading the DNA strand during the transcription, in order for the translation to begin.
Choice #1 & Choice#4 I believe
The Prairie dogs habitat is where the Prarie Dog lives in an ecosystem, a prairie dogs niche is what role it has in the ecosystem.
Aminoacyl-tRNA synthetase is an enzyme whose function is to synthesize charged tRNA, specific tRNA biding to specific amino acid such as Met-tRNA(AUG).
<span>If you are a chicken breeder who is interested in developing new hybrids that have many of the genes from the original ancestor birds, you should breed your birds with other birds that have similar genes to the original ancestor birds. In this way, you can combine the ancestor birds genes with those of your own birds to create a new hybrid.</span>
