GEOLOGY

Detailed explanation-1: -Molecular clock data suggests land colonisation occurred around 515 million years ago (in the Cambrian period), while the earliest plant stem fossils occur around 430 million years ago (in the mid-Silurian period).

Detailed explanation-2: -All the analyses indicate that land plants first appeared about 500 million years ago, during the Cambrian period, when the development of multicellular animal species took off.

Detailed explanation-3: -An international study has found a drought alarm system that first appeared in freshwater algae may have enabled plants to move from water to land more than 450 million years ago – a big evolutionary step that led to the emergence of land animals, including humans.

Detailed explanation-4: -"The movement of life from water to land–called terrestrialisation–began with plants and was followed by animals and then, of course, humans.

Detailed explanation-5: -One of the most significant events in the history of our planet, with tremendous repercussions for the evolution of earth’s organisms and ecosystems, was the colonization of terrestrial environments by plants ∼470 million years ago 1, 2, 3.