If an opaque material appears to be green, then which of the following can be concluded?
All color frequencies of light are reflected, except for green which is absorbed.
All color frequencies of light are absorbed, except for green which is reflected.
All frequencies of light are reflected, but green is reflected at a different angle than all others.
Green is the only frequency of light that is absorbed.

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.