Chordates possess all of the following structures except a. pharyngeal pouches. b. fins. c. notochord. d. hollow nerve cord.

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.

In the first stage of the nuclear fuel cycle the spent fuel must be transported, processed, and disposed of properly. true or false

Which muscle cell structure stores calcium ions that are used to trigger the contraction?