Do the wings of birds and insects suggest an evolutionary relationship? How do you know?

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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.

What causes darkening of the skin as melanin production increases

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates