Some DNA-DNA hybridization data place the giant panda in the bear family (Ursidae), but place the lesser panda in the raccoon family (Procyonidae). The similarity of body morphology of these two animals must therefore be due toa. inheritance of acquired characteristics. b.sexual selection. c.inheritance of shared derived characters. d.convergent evolution. e.possession of shared primitive characters.

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.