Birds differ from earlier vertebrates by ____
a. the presence of feathers
b. producing land eggs
c. the ability to maintain a constant body temperature through metabolic activities
d. the ability to fertilize eggs internally
e. their possession of a dorsal nerve cord
ANSWER: c
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In the accompanying figure, the portion of the molecule containing the anticodon is indicated by the label:
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
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