Plough land, plant a crop, water, fertilize, harvest, and repeat each year.

犁地、种庄稼、浇水、施肥、收获。年而复始。

They are actually older than land plants.

它们实际上比陆地植物更古老。

Why algae? Well, because land plants evolved from this green goo.

为什么是藻类？因为陆地植物由这种绿色粘性物质进化而来。

Here is a phylogeny of the land plants that are alive today.

这是现存陆地植物的系统发育图。

To better understand the evolution of land plants, researchers looked at the DNA of two species of algae.

为了更好地了解陆地植物的进化，研究人员观察了两种藻类的DNA。

We have the development of land plants to thank for all the land animals that exist, including humans.

我们要感谢陆地植物的发展，感谢所有陆地动物的存在，包括人类。

She added that scientists believe radiocarbon dating land plants gives more correct results than dating plants living in water.

她补充说，科学家认为放射性碳定年法测定陆地植物的年代比测定水中植物的年代更准确。

Another descendant split off and made the move to dry land, and eventually diversified into land plants.

另一个后代分离出来，迁移到干旱的陆地上，最终分化成陆地植物。

The scientists compared the genomes of the two algae species to both land plants and other types of algae.

科学家将这两种藻类的基因组与陆地植物和其它藻类的基因组进行了比较。

And the only place that they were found, beyond algae and land plants, were bacteria-and in particular, soil bacteria.

除了藻类和陆地植物之外，我们只在细菌中发出了类似基因，尤其是土壤细菌。

If you are a farmer, you might work in another kind of field --an area of open land planted with crops.

如果你是一个农民，你可能会在另一类田地里工作——一块种着庄稼的开阔空地。

For their study, the team focused on a group of algae known to be the closest living relatives of land plants.

在研究中，团队将重点放在一组已知的陆地植物近亲藻类上。

On land, plants became trees, growing massive or spreading their spores only once before dying.

在陆地上，植物变成了树木，长得很大，或者在死前只传播一次孢子。

But, for most of the history of land plants, gymnosperms were dominant.

但是，在陆地植物的大部分历史中， 裸子植物占主导地位。

But early in the GOBE, the very first land plants sprouted on the primordial rocks.

但在 GOBE 早期，第一批陆地 植物在原始岩石上发芽。

And it looks like land plants started diversifying almost as soon as they left the oceans.

看起来陆地植物几乎一离开海洋就开始多样化。

But thanks to natural selection, land plants developed a bunch of new adaptations, or traits that help organisms survive in their environments.

但由于自然选择，陆地植物发展了一系列新的适应性，或者说帮助生物在其环境中生存的特征。

Some of their descendants stayed put in the water, and eventually diversified into Green Algae, the closest living relatives to today's land plants.

它们的一些后代留在了水里，最终分化成绿藻，与今天的陆地植物最接近的近亲。

They're the most diverse group of land plants, with around 300,000 known species, while today's gymnosperms number around 1000 species.

它们是最多样化的陆生植物群，已知约有 300,000 种， 而今天的裸子植物约有 1000 种。

Well, all land plants lose water when the pores on their leaves open up during photosynthesis, and this evaporation draws more water up through their stems.

所有陆生植物在进行光合作用时，水分会从叶片上打开的气孔散失，这些蒸腾的作用会拉升更多水分进入树干。