Which is an example of an ecosystem? a. one northern cardinal b. one group of yellow-bellied cuckoos c. groups of ruby-throated hummingbirds, white oak trees, and brown-headed cowbirds d. groups of wild turkeys, american robins, and blue jays in an oak forest with an annual precipitation of 105.9 cm

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.

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

What are the responsibilities of the region of the brain highlighted below? =+= will rate brainiest =+=