Which of following embryonic germinal tissue layers form all tissues and organs? 1. Endoderm 2. Mesoderm 3. Ectoderm 4. Mectoderm
a. 2 only
b. 2 and 3 only
c. 1, 2, and 4 only
d. 1, 2, and 3 only
ANS: D
The three embryologically distinct germinal tissue layers form all tissues and organs: endoderm, mesoderm, and ectoderm.
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