This is always interesting to discuss, as many different physical and physiological adaptations must have been made at different times to allow the transition to land environments.
For plants, moving from the water to land, they needed to protect themselves from dessication (drying out). The waxy cuticle found on most plants would have prevented water loss from the plant as a whole, while stomata allowed for exchange of gases through this hydrophobic protective layer. Reproductive processes would have to be modified, as plants were not able to simply release ...
In this solution, I discuss the adpatations made by plants and animals to the land environment.