What Are the Difficulties of Living on the Land?

We need to consider not only humans and the land animals that survived the flood, we've been focusing on those so far. We also need to consider the plants that live on land, the aquatic plants and the aquatic animals,. What's the issue with the plants that were on the land? Well, the first thing to note is they would have died. If you take plants adapted for living on land and put them under water for a year, they die. This causes difficulties. Now we're starting to look at difficulties connected with the creatures that survive the flood. There are several things we should look at under this heading. What's the first? I'll come back to the genetic evidence because