The correct sequence of development of embryonic stages in humans is:

1. Zygote → Blastula → Blastocyst
2. Zygote → Gastrula → Blastula
3. Zygote → Blastocyst → Gastrula
4. Zygote → Gastrula → Blastocyst

Subtopic:  Embryonic Development till Gastrulation |
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