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Development in all the fertilized eggs occurs in a definite sequence which of these is a correct sequence?

[A].	Zygote, cleavage morula, blastula gastrula	[B].	Zygote, morula, blastula, cleavage, gastrula
[C].	Zygote, blastula, morula, eleavage gastrula	[D].	Zygote, morula, blastula, gastrula, cleavage

Answer: Option A