The swim bladder is an organ in primitive fish from which the lungs of terrestrial vertebrates developed.
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Q9: Marsupials are distinguished by
A)a marsupium.
B)mammary glands.
C)opposable thumbs.
D)nails.
Q10: Evolutionarily,the jaws of vertebrates developed from
A)the circular
Q11: A distinguishing feature of the Squamata is
Q12: Birds are different from all other living
Q13: Hagfish are classified as vertebrates,but they do
Q15: What is a defining characteristic of members
Q16: Reptiles are better adapted to life on
Q17: The nearest living relatives of crocodiles and
Q18: You need to explain to your study
Q19: Eutherian mammals are uniquely defined by
A)having a
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