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Reading Comprehension :: RE: OG Conodonts, the spiky phosphatic remains

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Author: DavidG@VeritasPrep
Posted: Wed Sep 27, 2017 11:14 am (GMT -8)

Quote:
514) According to the passage, the anatomical evidence provided by the preserved soft bodies of conodonts led scientists to conclude that
A. conodonts had actually been invertebrate carnivores
B. conodonts' teeth were adapted from protective bony scales
C. conodonts were primitive vertebrate suspension feeders
D. primitive vertebrates with teeth appeared earlier than armored vertebrates
E. scientists' original observations concerning the phosphatic remains of conodonts were essentially correct
In the second paragraph we're first given what the traditionalists believe: Thus, traditionalists argued, these animals developed coverings of bony scales or plates, and teeth were
secondary features
In other words, scales or plates came before teeth.

The discovery of the conodonts undermined the traditionalist belief. Note the last line of the passage: It now appears that the hard parts that first evolved in the mouth of an animal improved its efficiency as a predator, and that aggression rather than protection was the driving force behind the origin of the vertebrate skeleton.

So teeth came first. The answer is D
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