1) Penguins, seals, and tuna have body forms that permit rapid swimming, because ________.

1. A) all share a recent common ancestor
2. B) all of their bodies have been compressed since birth by intensive underwater pressures
3. C) the shape is a convergent evolutionary solution, which reduces drag while swimming
4. D) this is the only shape that will allow them to maintain a constant body temperature in water

2) As animals have evolved large body size, they have also evolved adaptations to improve exchange of energy and materials with the environment. For example, in many larger organisms, evolution has favored lungs and a digestive tract with ________.

1. A) more branching or folds
2. B) increased thickness
3. C) larger cells
4. D) decreased blood supply

3) Much of the coordination of vertebrate body functions via chemical signals is accomplished by the ________.

1. A) respiratory system
2. B) endocrine system
3. C) integumentary system

D) excretory system