the answer your looking for is D
The two DNA strands are held together by hydrogen bonding between the bases on the different strands; therefore, all the bases are on the <u>inside of the double helix</u>, and the sugar-phosphate backbones are on the <u>outside.</u>
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The two strands are held collectively via hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine.
Covalent bonds arise inside every linear strand and strongly bond the bases, sugars, and phosphate groups (each within each thing and between additives).
Hydrogen bonds occur among the two strands and contain a base from one strand with a base from the second in complementary pairing.
Learn more about Hydrogen bonds here: brainly.com/question/1420470
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Answer:the hierarchy technique.
Explanation
It is a top- down analysis used to identify the sequencial order of prerequisite arrangements.
Tectonic boundaries is the correct answer
Life does exist in the Mariana Trench, even at its deepest spots. The organisms living here are mostly a wide variety amphipods, sea cucumbers, sea anemones, etc. These organisms survive mostly by feeding off of the dead living beings on the upper layers of the Trench, which fall down to the depths as a result of gravity.