Question

Living on land required that plants ____.

Answer 1

I think it would be to exchange gases.  When you think about it, plants in the past were always underwater.  They didn't have any air.  Now, they are on land and need to be able to exchange gases from the leaves to the roots.  

Answer 2

B. Conservar Agua

ThAnKs YoU 4 Da LiKe YoUr AbOuT tO dRoP

gimme dat like ;p