Which of the folowing best decribes the shape of a DNA moleclue?

The answer is letter A, "Two strands of nucleotides bonded together at their bases, twisting to form a double helix." When it comes to RNA, a single helix will form.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.