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Why are the offsprings of oviparous anim...

Why are the offsprings of oviparous animals are at a greater risk as compared to offsprings of viviparous organisms?

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Oviparous animals are egg-layers. The eggs containing embryo are laid out of their body and are highly susceptible to environmental factors (temperature, moisture etc.) and predators. Whereas, in viviparous animals, the embryo develops inside the body of female and comes out as young ones. Hence offsprings of oviparous animals are at risk compared to viviparous animal.
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