Molluscs were the first organisms to have a(an) ______ body plan and well-developed organ systems.

Name: Molluscs were the first organisms to have a(an) ______ body plan and well-developed organ systems.
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Molluscs were the first organisms to have a coelomate body plan, which means they have a true body cavity (coelom) that is completely lined with mesoderm tissue. This allows for the development of more complex and well-organized organ systems.

Molluscs Were the First Organisms to Have A(an) ______ Body