Which statement describes the effects of farming practices such as the overuse of irrigation water? A. More areas have polluted soil, increasing crop variety. B. Fewer areas have polluted soil, reducing crop variety. C. More areas have polluted soil, reducing crop variety. D. Fewer areas have polluted soil, increasing crop variety.​

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.

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

What class of levers is shown in this image?