A DNA molecule consists of two stands of nucleotides that wind around each other like a twisted ladder with a phosphate and sugar backbone. The nitrogenous bases are divided into two groups called the pyrimidines and the purines. The pyrimidines include the thymine and cytosine, the purines are adenine and guanine. The nitrogenous bases in the double helix are bound together according to the base pairing rule. Adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C). The student either drew the base pairing showing adenine and thymine or guanine pairing with cytosine.
D. Geographic separation of a population
The answer is C. Your eyes respond the the amount of light going into your eyes so they get smaller when exposed to more light and dilate when the amount of light is lessened
The answer is Algae and Photosynthesis Hope this helps! ;D
