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Bilateral Symmetry had two advantages:
Three basic kinds of body plans
The body cavity made possible the development of _____________
__________ developed a circulatory system to _________ and _________
Open circulatory system:
Closed circulatory system:
Bilaterians can be divided into two groups:
Protostomes develop the _______ first from or near the ________
Anus in protostomes (if present) develops either from _______ or ___________
Deuterostomes develop the _______ first from the _______
Mouth in deuterostomes develops later from another region of the ________
____________evolved from ______________ more than 500 MYA
Multicellular animals, or _________, are traditionally divided into ___ or so distinct phyla based on shared __________________
Metazoans are divided into two main branches:
Most taxonomists agree that the animal kingdom is _______________
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