5. how might the fitness cost of photorespiration in c3 plants favor the evolution of ca plants? 6. how do leaf hairs that surround guard cells reduce water loss through the process of forming a boundary layer? 7. when animals hibernate, they lower their temperature. how would this reduce the rate of heat lost through conduction? 8. in addition to having highly efficient kidneys, what behaviors could you imagine desert animals using to reduce water loss? 9. if you designed an experiment to determine how temperature and the species composition of seeds affect the growth and reproduction of seed-eating birds, what would be the independent and dependent variables? 10. if you were to stand in a river with fast-moving water, which heat exchange processes might occur and why?