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प्रश्न
How are the reproductive characteristics of mammals different from those of aves?
संक्षेप में उत्तर
उत्तर
| Mammals | Aves | |
| 1. | Mammals have paired sex organs, eggs are small with little or no yolk. | They are oviparous and lay eggs. |
| 2. | They are viviparous and give birth to young ones. | The formation of the placenta is not seen. The embryo is nourished, by egg yolk. The egg has an abundant quantity of yolk. |
| 3. | Formation of placenta is a special feature. The tissue connects the foetus to maternal tissues. |
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