According to plasmic theory...Egg came first....Bcz Egg is a kind of cell...and initial level of an organism starts from cellular level so definitely cell or we can say egg came first and further developed into Hen which is basically a complete organism... Actually you need basic information regarding the theory which proved itself...That egg came first and this not happen just in a day or month.... actually need of the phase is years and years.... It's a bit longer theory...I just suggest you to go through the theory....for complete explanation and better understanding.
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