Which of the following statements is true concerning feedback mechanisms?

a. blood glucose levels are regulated by positive feedback mechanisms.
b. negative feedback mechanisms work to prevent sudden severe changes within the body.
c. positive feedback mechanisms always result in excessive damage to the host.
d. negative feedback mechanisms tend to increase the original stimulus.

When organisms convert from of energy, what usually results

What is the most appropriate method of gaining weight (muscle mass)

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .