Answer:
In external fertilization, syngamy occurs in the external medium (water) i.e., outside the body of organism e.g., majority of algae, fishes as well as amphibians.
Disadvantages. Organisms undergoing external fertilization release a large number of gametes indicating higher rate of synchrony between the sexes. In fishes and frogs etc., large number of offsprings are produced. But such offsprings are highly vulnerable to predators threatening their survival up to adulthood.
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