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15) Which of these is not considered an amniote?

33) The force driving simple diffusion is ________, while the energy source for active transport is ________.

15) Which of these is not considered an amniote?

16) Why is the amniotic egg considered an important evolutionary breakthrough?

43) In the digestive system, peristalsis is ________.

21) Mechanical digestion, the process of breaking down large chunks of food into smaller pieces, is important because smaller pieces of food ________.

21) Mechanical digestion, the process of breaking down large chunks of food into smaller pieces, is important because smaller pieces of food ________.

8) Which of the following combinations of phylum and description is incorrect?

17) Which of the following are the only extant animals that descended directly from dinosaurs?

36) Birds secrete uric acid as their nitrogenous waste because uric acid ________.