Which of the following statements best describes the jawless fishes?
A. Endotherms that have a smooth nonscaly skin.
B. Ectotherms that have a smooth nonscaly skin.
C. Vertebrates that have scales and are ectothermic.
D. Ectotherms that have a bony skeleton.
Answer: B
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a. hydrogen b. polar covalent c. nonpolar covalent d. ionic e. peptide
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