Is just a chemical reaction that compels animals to breed.

不过是让动物繁衍后代化反应罢了。

Trilobites have no direct descendants, but their evolutionary cousins are alive and well.

三叶虫没有直系后代，但它演化上表亲现仍然活得很好。

I'm descended from the third brother!

是那第三个兄弟后代！

Natural selection might be expected to favour the progeny of men who enjoy bringing them up.

自然选择也许更偏爱那些乐于带孩子男人后代。

But in hurricane-free areas, docile colonies had more babies.

但没有遭遇飓风袭击地区，温和蜘蛛群繁衍后代数量更多。

That is what we owe our forebearers, one another, and generations to follow.

这是欠祖先、彼此和后代。

Together we can achieve a sustainable future for generations to come.

一起为子孙后代实现可持续未来。

They could easily be Slytherin's descendants.

他很可能是斯莱特林后代。

It is the child of a donkey and a horse.

它是驴和马后代。

Any offspring of these modified mice would inherit Lyme disease immunity.

它所有后代将对莱姆病菌免疫。

Scientists say that these defenses are passed down to plants offspring through their seeds.

科家说，这些防御通过种子传递给植物后代。

Crucially, he retained his claim on the French throne, as did his descendants.

至关重要是，他保留了对法国王位主张，他后代也是如此。

You survive and reproduce, and pass that trait on to some of your offspring.

你存活下来，繁衍后代，并将这种特质遗传给你后代。

The offspring that have beaks like yours flourish.

长着你这样喙后代会茁壮成长。

They showed how genetic qualities are passed to living things from their ancestors.

他展示了基因品质是如何从祖先遗传给后代。

We're the children of this type of micro-organism.

是这种微生物后代。

Some of these mixotrophs even transmit the algae to their offspring.

其中有些混合营养生物甚至将藻类传给自己后代。

This makes their offspring more vulnerable to predation than those of the tunnelers and rollers.

与挖道蜣螂和滚粪蜣螂相比，这种方式使它后代更容易遭到猎食。

Highly symmetrical bodies in animals might signal quality genes, and better offspring.

动物界存高度对称体型可能代表着高质量基因、以及更好后代。

Which would make them and their offspring an easy meal.

这会使树蛙及其后代轻易成为天敌盘中餐。