GEOLOGY

Detailed explanation-1: -At present, fossil evidence of land plants dates to the Ordovician Period (about 485.4 million to 443.8 million years ago) of the Paleozoic Era.

Detailed explanation-2: -The Devonian Period: During the Devonian Period (410–360 million years ago), the first seed plants evolved. Seeds have a protective coat and stored food to help these plants survive. Seed plants eventually became the most common type of land plants.

Detailed explanation-3: -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-4: -Land plants evolved rapidly into the vacant niches afforded them on land. By the end of the Devonian, forests of progymnosperms, such as Archaeopteris dominated the landscape. By the end of the Paleozoic, cycads, glossopterids, primitive conifers, and ferns were spreading across the landscape.

Detailed explanation-5: -Land plants first appeared during the Ordovician period, more than 500 million years ago.