"Our results show the ancestor of land plants
was alive in the middle Cambrian Period, which was similar to the age for the first known terrestrial animals."
However, once the first land plants
came into existence about 470 million years ago, this regulatory mechanism broke down, paving the way for the evolution of the vast variety of complex life that we see around us today.
The origin, development, and function of the diffuse anastral spindle of land plants
are fundamental questions in evolutionary and developmental biology.
Among land plants
, the genomes of the simplest variety -- mosses -- and of the most complex -- seed plants -- have already been sequenced.
don't make porphyran, but it shows up in seaweeds such as the dried, dark nori in sushi.
The agreements cover the supply, modification and maintenance of turbo machinery on all Statoil-operated platforms and land plants
. Including options for five additional years, the agreements are estimated to be worth a total of NOK7.8bn.
finally emerged more than 3 billion years later.
Like land plants
, they use photosynthesis--the process of capturing the sun's energy to turn carbon dioxide and water into food.
The life of plants from single cell organisms in the ocean through seaweeds and algae to the 'top dogs' of the plant world, land plants
and trees is a world unknown to most.
"Fossils of some of the first land plants
on the planet have been found in the rock up there and there are still rare sub-Arctic alpine plants growing on the northern slopes.
The team said it was commonly believed that there were several lineages of land plants
within the green plant group.