The medullary tube is formed by

Options :
  1. ectoderm
  2. mesoderm
  3. edoderm
  4. none of the above
Answer and Explanation :-

Answer: Option 1

Explanation:

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There is but one truly serious philosophical problem and that is suicide. Judging whether life is or is not worth living amounts to answering the fundamental question of philosophy. All the rest - whether or not the world has three dimensions, whether the mind has nine or twelve categories - comes afterwards. These are games one must first answer.
-Albert Camus