Question

how is test tube baby different from natural one

Answer 1

It is smaller in size.

Answer 2

In case of a test tube baby, the egg and sperm fuse outside the body of the mother, in a lab. The zygote grows in glass. The zygote is then implanted in the mother's uterus.
In case of a normal baby, fertilisation and development take place inside the mother's womb only.

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