Define external fertilization. Mention its disadvantages.
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external fertilization is the fusion of gametes in the external medium... it requires co ordination between both the animals... large no. of gametes must be produced since most of them are lost in water.... there is a danger to the zygote until it grows
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In external fertilization eggs have less chances of fertilization. This can lead to the wasteg of large number of eggs produce during the process. Furher there is an absence of proper parantel care to the offspring which result in a low rate of the survival in the progenies.
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