Which one of the following statements is correct?
a. ______ The first flying vertebrates were plesiosaurs; b. ______ Icthyosaurs look much like living opossums; c. ______ Most Triassic plants were angiosperms; d. _______ Rudists were important Mesozoic reef-building animals; e. ______ The lower jaw of archosaurs was made up of a single bone.
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