Sensory receptors, such as retina, develop from

Options :
  1. ectoderm
  2. endoderm
  3. mesoderm
  4. mesoderm and endoderm
Answer and Explanation :-

Answer: Option 1

Explanation:

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But when it came right down to it, the skin of my wrist looked so white and defensless that I couldn't do it. It was as if what I wanted to kill wasn't in that skin or the thin blue pulse that jumped under my thumb, but somewhere else, deeper, more secret, and a whole lot harder to get.
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