Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals ?

Explanation

Oviparous animals lay eggs outside their body,
These animals are under continuous threat from various environmental factors and predators.
In viviparous animals, the development of the egg occurs inside the body of the females.
Hence, offspring of oviparous animals are at a greater risk as compared to offspring of viviparous animals.