Women often have complications during labor while giving birth to very large babies, whereas very small babies tend to be underdeveloped. Which kind of selection is most likely at work regarding the birth weight of babies?
A. Disruptive selection
B. Stabilizing selection
C. Directional selection
Ans: B. Stabilizing selection
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In humans and many other animals, what organ system is involved in bulk transport of nutrients, oxygen, and signaling molecules?
A. respiratory system B. circulatory system C. immune system D. digestive system
Who was the first scientist to pursue a "magic bullet" that could be used to treat infectious disease?
A) Jenner B) Pasteur C) Ehrlich D) Lister E) Semmelweis
Which of the following should determine whether an individual should join a group?
a. The individual is social and enjoys being around other individuals. b. The individual is affected by parasitism. c. The individual's fitness is improved when living in a group. d. The individual is in competition with others for food.
Where a given species of vertebrate lives has dramatically shaped the evolution of respiratory adaptations, particularly since the oxygen concentration in air is approximately 20 times that of the oxygen concentration in water. Per unit area of gas exchange surface, which group of vertebrates can extract the greatest total amount of oxygen from the external medium?
A. Reptiles B. Fish C. Birds D. Mammals E. Amphibians