The Transition from Fish-To-Amphibian Involved a Series of Changes in the Vertebrate

question 9

Multiple Choice

The transition from fish-to-amphibian involved a series of changes in the vertebrate lineage that are all now very well documented.Which of the following statements accurately reflects our knowledge of these evolutionary events? Check all that apply.

• A) Early amphibian fossils,such as Ichthyostega,show important transitional characteristics including mobile neck,loss of opercular bones,appendages with digits,loss of fin rays,and fused sacral vertebrae.
• B) Ancient tetrapodomorph fossils,such as Tiktaalik,show important transitional characteristics such as cervical vertebrae,tetrapod-like forelimbs,dorsoventrally compressed skull,and the loss of opercular bones.
• C)Molecular analyses,such as the study of the structure of Hox genes,provide powerful evidence supporting evolution of tetrapod appendages.
• D) New fossil evidence now indicates that the anurans are basal tetrapods.Higher vertebrates,including mammals,evolved from the frog/toad lineage.
• E)We now know precisely the tetrapodomorph species that became the first amphibian.

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