Asmall population of a specific bird species lives on an island in the pacific ocean. all of the birds of this species have a crest of feathers on their heads. the color of the crest can be orange, yellow, or white. an individual's crest color does not effect its chance of survival or its reproductive success.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes