Cephalization
(2) Primary induction
(3) Tube-in-a-tube plan
(4) Solid body plan
Primary induction
Tube-in-a-tube plan
Solid body plan
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The Correct Option isB
Solution and Explanation
Primary induction refers to the interaction between germ layers such as mesoderm and endoderm to form complex organs like the stomach and gizzard in eucoelomates.