When an animal leaves more offspring, its genes will spread.

当动物繁出更多代时， 就意味着它们基因得到传播。

For years, palaeontologists have wondered if the same was true of plesiosaurs.

数年来，古生物学家一直想知道蛇颈龙是否也通过怀胎方式繁代。

At that age, they reach sexual maturity, meaning the fish were able to produce young.

它们在这个年龄达到性成熟，这意味着它可以繁代。

The hope is that the oysters will help clean the water and also have babies.

人们希望这些牡蛎能够帮助清洁海水并繁代。

Question 2. To mate and then produce young animals.

交配，然繁代。

And she added that it also allows them to reproduce more throughout their life.

“这也让它们在一生可以中繁更多代。”

Like all organisms, tomatoes make more offspring than can survive in nature.

和所有生物一样，西红柿在自然界中繁代数量超过了它生存能力。

Only those rats given the saline sired offspring.

只有那些注射了生理盐水老鼠能繁代。

The Penguins migrate to the frozen sea ice every year to breed and raise their young.

企鹅每年都会迁移到结冰海冰上繁和养育代。

By 1511, every ship leaving the Americas for Spain was ordered to bring back five breeding pairs.

到1511年，每艘离开美洲前往西班牙船只都被命令带回五对可以繁代火鸡。

At best, their dietary rigidity could limit their ability to reproduce or to care for their young.

即便作最乐观估计，它们这种僵化食谱也会限制它们繁能力或扶养代能力。

And he'll spend the next three years on the sea before eventually returning to breed as a breeding adult.

他将在海上度过接下来三年，最终以成年海鹦繁代身份返回陆地。

First, some organisms reproduce asexually, so they don't need other organisms to produce offspring.

首先，有些生物是无性繁，所以它们不需要其他生物来繁代。

Unlike most other kinds of fish, they are not able to reproduce for several years, and also produce fewer young.

与大多数其他种类鱼不同，它们在数年内都无法繁，而且代也更少。

So we're talking about core tenants of Darwin's theory and more offspring are always produced for a species than can survive.

所以我们在谈论达尔文理论核心宗旨以及繁代总是比能够生存下来代多。

If you put in a lot of parental care, then you don't have the resources to make lots and lots of babies.

如果在抚养方面投入太多，那用来繁大量代精力就会不足。

One of the core tenets of Darwin's theory is that more offspring are always produced for a species than can possibly survive.

繁出代多余能生存下来代。

They produced young generally by laying eggs.

它们通常通过产卵来繁代。

Do they multiply by laying eggs or giving birth to babies?

他们是通过下蛋，还是产仔来繁代呢？

Their reproductive offspring inherit the throne, meaning that their colony may persist for decades to come.

他们繁代继承了王位，这意味着他们民地可能会持续数十年。