What is the carrying capacity of an ecosystem?
a. the total number of organisms at any time
b. the number of predators in the ecosystem
c. the number of keystone species in the ecosystem
d. the largest population that can be supported

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.

In 2001, records showed that local stocks of fish were down worldwide. yet, records of harvests indicated that fish were being taken at records rates. what was actually happening?

The wind speed in the region between cities a and b was probably the greatest at noon on which day?