What is meant by the terms 'internal fertilisation' and 'external fertilisation' ? Explain with examples.

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Solution

Internal fertilization happens inside the body, for example, mammals having sex or artificial insemination to create an embryo. External fertilization happens outside the body, for example, fish spawning in a river or in vitro fertilization.

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Differentiate between internal fertilisation and external fertilisation. What type of fertilisation takes place in (a) frog, and (b) fox?

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