Question
Differentiate between in vitro fertilisation and in vivo fertilisation.
| In vitro fertilisation | In vivo fertilisation |
| When fertilisation is induced to occur outside the body of the organism, under conditions similar to that inside the body, it is called in vitro fertilisation. | When fusion of gametes, i.e. fertilisation occurs naturally inside the body of the organism, it is called in vivo fertilisation. |
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OR
Sometimes alien species affect the indigenous organisms leading to their extinction. Substantiate this statement with the help of any two examples.