Question: what are the four major evolutionary steps of plants?
Answer: origin of plants from algae. evolution of vascular tissue. evolution of seeds. evolution of. 475 million years ago. The carboniferous was dominated. ...  354 to 290 mya. The Cretaceous was dominated by conifers and also saw the advent of the flowering plants. ...  144 to 65 mya. 23.8 to 5.3 mya.