Generally speaking how is metabolic rate related to the size of an organism?

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.

You see a white marker with an orange circle and black lettering. what does this marker tell you

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.