The characteristics of dna include which of the following?

dna is made of nucleotides consisting of a sugar, a phosphate group, and a carbon base.
dna is made of a single polynucleotide chain, which winds into a double helix.
dna is how inherited characteristics are passed from one generation to the next.
all of the above

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.