1. The kangaroo is a viviparous animal, giving birth to live young instead of laying eggs.
袋鼠是一种胎生动物，它们生下活仔而不是产卵。

2. Many mammals, including humans, are viviparous and give birth to live offspring.
许多哺乳动物，包括人类，都是胎生的，生下活仔。

3. Viviparous plants produce seeds that germinate while still attached to the parent plant.
胎生植物产生的种子在仍然附着在母体植物上时就开始发芽。

4. The viviparous lizard is able to give birth to live young without laying eggs.
胎生蜥蜴能够生下活仔而不产卵。

5. Some fish, such as guppies, are viviparous and give birth to live fry.
一些鱼类，比如孔雀鱼，是胎生的，生下活仔。

6. The viviparous nature of certain species allows them to adapt to varying environmental conditions.
某些物种的胎生特性使它们能够适应不同的环境条件。