UNICEF estimates that ______ babies die each year in developing countries because they are bottle-fed rather than breast-fed

Kevin watches as his wife Denise walks toward the house. Even though the retinal image of Denise grows larger as Denise approaches, she does not appear to be growing larger as she moves closer and closer to Kevin. This scenario illustrates _______________

a. relative size b. size constancy c. retinal disparity d. linear perspective

Which of the following is an example of sexual selection?

A. A sex-linked adaptation develops in a species of cats. B. A predator species develops more precise vision. C. A species of bird develops a mating call. D. A species of deer develops a new fur color that helps camouflage it.