Mammal Lungs Are Surrounded on the Outside by the _________

Q8: Which of these animals uses positive pressure

Q11: In tissue capillaries, _ combines with water

Q15: The principal reasons for which gills were

Q16: The _ is a covering over the

Q18: The most efficient lungs are found in

Q19: Most of the primitive phyla of invertebrates

Q20: The blood obtains its oxygen by diffusion

Q21: _ is the carrier molecule that transports

Q22: Which of these animals has one-way flow

Q43: Soft-shelled turtles can remain submerged underwater for