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Zoology 10th Edition by Stephen Miller,John Harley
Edition 10ISBN: 978-0077837273Zoology 10th Edition by Stephen Miller,John Harley
Edition 10ISBN: 978-0077837273 Exercise 12
The Animalia is a monophyletic group. A few animal phyla arose independently of any other group. Bilaterally symmetrical animals share a common ancestry. Protostomate animals share developmental characteristics such as spiral determinant cleavage and include the lophotrochozoan and ecdysozoan lineages. The Deuterostomia share developmental characteristics such as radial indeterminant cleavage.
The repetition of body parts, segmentation, was once believed to be a character that united the Arthropoda and the Annelida into a common lineage. Segmentation is also present in the Chordata. It is not present in Echinodermata, Nematoda, Rotifera, and other bilateral phyla. Based on this information and the tree diagram on the inside front cover, what must be true of the evolutionary origin of segmentation?
The repetition of body parts, segmentation, was once believed to be a character that united the Arthropoda and the Annelida into a common lineage. Segmentation is also present in the Chordata. It is not present in Echinodermata, Nematoda, Rotifera, and other bilateral phyla. Based on this information and the tree diagram on the inside front cover, what must be true of the evolutionary origin of segmentation?
Explanation
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The rate of evolutionary changes determi...
Zoology 10th Edition by Stephen Miller,John Harley
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