Biology
In test tube baby

Fertilization of ova takes place in test tube which development of embryo occur in uterus
Fertilization of ova and development takes place in test tube
Fertilization takes place in uterus while development takes place in test tube
Development of ova take place in test tube without fertilization

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Biology
Function of pace maker is

To start the process of respiration
To initiate heart beat
To regulate the process of digestion
To regulate the formation of urine

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