Lucas built a model to show the effect of human population growth on an aquifer that supplies water for a growing city Recent measurements show that the levels of water in the aquifer are dropping at a rate that correlates with population growth.
Lucas placed a tub under a stream of water until the tub filled and began to overflow. Then he used a water pump to begin
removing water from the tub. At first he pumped slowly, and the water still overflowed. Then he pumped harder until, eventually, the
water level in the tub began to go down
What is represented by the pump in this model?
OA. the containment of the water in an underground area
OB. the water that enters the aquifer due to precipitation and runoff
OC. the amount of water that flows out of the aquifer as natural springs
OD. the amount of water from the aquifer that is used by the city

Many bird species build nests in which they raise their offspring. one of these species is known as the magnolia warbler. breeding pairs of magnolia warblers build nests out of pieces of grass and twigs. the female warbler will then lay her eggs in the nest and sit on the eggs for a few weeks until they hatch. after the offspring have hatched, the female will continue to sit on the newborn chicks to keep them warm. both the male and the female bring food for the offspring to eat until the young are mature enough to find food on their own. which of these most likely describes why birds such as the magnolia warbler build nests in which to raise their offspring? a. nest building decreases the amount of energy used by the parent birds to raise their offspring to adulthood. b. nest building increases the probability that the offspring will survive and eventually produce offspring of their own. c. nest building decreases the amount of food that the offspring require the adult birds to provide. d. nest building increases the probability of the offspring being located by airborne predators.