Plants and algae most recently shared a common ancestor abou

Plants and algae most recently shared a common ancestor about 500 million years ago, and plants colonized land shortly after that. Light, water, minerals, and dissolved gases surround the whole body of a submerged green alga, and the buoyancy of water provides physical support. What adaptation did terrestrial plants acquire in order to exchange gases without drying out when they moved to dry land?

Solution

The answer is development of Stomata. Those are tiny pores, used for gas exchange.