A) Sea urchin
B) Earthworm
C) Sand dollar
D) Ichthyophis
Correct Answer: B
Solution :
Earthworm is not a deuterostome. Deuterostomes are distinguished by their embryonic development. In these animals, the first opening (the blastospore) becomes the anus, while in protostomes it becomes the mouth. Deuterostomes are also known as enterocoelomates because their coelom develops through enterocoely. There are four extant phyla of Deuterostomes-Chordata, Echinodermata, Hemichordata and Xenoturbellida.
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