What is the transitional organism from invertebrates to vertebrates?
a. Ophiuroids
b. Echinoids
c. Salps
d. Amphioxus
ANS: D
Amphioxus obtain both vertebrate and invertebrate characteristics. It has a well developed dorsal
tubular nerve chord. It also undulates its body in a fish-like manner. Information can be found in the
section Construction of Complex Chordate Bodies Begins on a Stiffening Scaffold.
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Fill in the blanks with correct word
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