Red blood cells are able to maintain homeostasis because they are bathed in blood, which is to the fluid in the cells themselves. explain the answer so i may better understand it.

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.

Why do we perceive objects as retaining their brightness under different lighting levels?

What are the pros and cons of quadrat sampling?