Open the Youtube video In the Ordovician period 470 million years ago, the first land plants – mosses and liverworts – produced more oxygen, eventually creating enough concentration of it to ...

Nonvascular plants are believed to have appeared during the Ordovician Period, around 485 to 443 million ... They can be further classified into the phylum Bryophyta, which includes mosses, liverworts ...

If you wish to manage your notification settings from this browser you will need to update your browser's settings for this site. Just click button below and allow notifications for this site Note ...