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The mesoderm lies in the embryo between the endoderm and the:

ABlastopore
BEctoderm
CCoelom one
DNotochord
Answer & Solution
Correct answer: B. Ectoderm
1. Two layers were already present before it. 2. The mesoderm forms in the space between them. 3. Those layers are the ectoderm and the endoderm. _Source: syllabus Biology, Chapter 4, Animal Kingdom._
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