Which statement about predator-prey populations is true? A. The relationship between predator and prey populations keeps both populations in balance.

B. A decrease in the prey population is followed by an increase in the predator population.

C. An increase in the predator population is followed by an increase in the prey population.

D. two of the above.

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

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.

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation