Which of these would a paleontologist be most likely to do in order to determine

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Which of these would a paleontologist be most likely to do in order to determine whether a fossil represents a reptile or a mammal? A) Look for the presence of milk-producing glands. B) Look for the mammalian characteristics of a four-chambered heart and a diaphragm. C) Because mammals are eutherians, look for evidence of a placenta. D) Use molecular analysis to look for the protein keratin. E) Examine the teeth. With which of the following statements would a biologist be most inclined to agree? A) Humans and apes represent divergent lines of evolution from a common ancestor. B) Humans evolved directly from Old World monkeys. C) Humans represent the pinnacle of evolution and have escaped from being affected by natural selection. D) Humans evolved from chimpanzees. E) Humans and apes arc the result of disruptive selection in a species of chimpanzee. Which of these groups is not considered an amniote? A) birds B) reptiles excluding birds C) amphibian D) placental mammals Unlike eutherians, both monotremes and marsupial mammals A) lack nipples. B) have some embryonic development outside the uterus. lay eggs. D) arc found in Australia and Africa. E) include only insectivores and herbivores. Which of the following structures is not required to be a chordate? A) Notochord B) Dorsal, hollow nerve cord C) Pharyngeal slits or clefts D) Muscular, post-anal tail E) Calcified spinal cord As hominins diverged from other primates, which of the following appeared first? A) reduced jawbones B)language C) bipedal locomotion D) the making of stone tools E) an enlarged brain

Explanation / Answer

31.Which of these would a paleontologist be most likely to do in order to determine whether a fossil represents a reptile or a mammal?   Examine the teeth.

32.With which of the following statements would a biologist be most inclined to agree? Humans and apes represent divergent lines of evolution from a common ancestor.

33. Amphibians. As All mammals and reptiles are amnoites.

34.Unlike eutherians, both monotremes and marsupials have some embryonic development outside the uterus

35Calcified spinal cord Chordates are defined by the presence of four morphological traits: a notochord, a dorsal nerve cord, pharyngeal gill slits, and a tail behind the anus.

36.As hominins diverged from other primates, which of the following appeared first?  bipedal locomotion

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