Oviparous animals like reptiles and birds lay hard-shelled, fertilized eggs in safe environments, with young hatching after incubation. Viviparous animals (most mammals, including humans) develop the zygote internally.
Negli animali ovipari come rettili e uccelli, le uova fecondate coperte da un guscio calcareo duro vengono deposte in un luogo sicuro nell'ambiente; dopo un periodo di incubazione nascono piccoli. D'altra parte, negli animali vivipari (la maggior parte dei mammiferi compresi gli esseri umani), lo zigote si sviluppa in un piccolo all'interno del corpo dell'organismo femminile.
| Text | In oviparous animals like reptiles and birds, the fertilised eggs covered by hard calcareous shell are laid in a safe place in the environment; after a period of incubation young ones hatch out. On the other hand, in viviparous animals (majority of mammals including human beings), the zygote develops into a young one inside the body of the female organism. |
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| Extra | SEXUAL REPRODUCTION 1.2.3 Post-fertilisation Events1.2.3.2 Embryogenesis |
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