Answer:
double helix
Explanation:
Deoxyribonucleic acid, commonly known as DNA, consists of two long polynucleotide chains composed of four types of nucleotide subunits i.e. A, G, C, T. Each chain is called a strand. Each nucleotide is made up of a pentose sugar, phosphate group and a nitrogenous base.
DNA is a double-helical structure that contains each strand in a spiral or coiled form. This double helix structure forms when two complementary strands are held together by hydrogen bonds. The bonding occurs between the nucleotide base portions of the complementary strands e.g G-C, A-T.
<span>Some of the first animals to develop an endoskeleton were: echinoderms.</span>
Classification helps us understand evolutionary ties between organisms.
<span>A condition of the unconsciousness is an effect of the shut down of "Conscious Brain"
In that situation, Our Brain feels tired, and can't make any major decision
Hope this helps!</span>
A stem<span> is one of two main </span>structural<span> axes of a vascular plant, the other being the root. The </span>stem<span> is normally divided into nodes and internodes: The nodes hold one or more leaves, as well as buds which can grow into branches (with leaves, conifer cones, or inflorescences (flowers)).</span>
