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What are the advantages and disadvantages of internal and external reproduction?

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Internal reproduction:
Advantages -
- independent of external water medium (eg. ponds, streams etc.)
- Prevent wastage of gametes and embryo
- Greater chance of fertilisation
- Embryo is nourished and protected
Disadvantages -
- Intermittent organ must be developed
- Complicated behaviour must be evolved to bring the male and femal into intimate contact
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