Maybe I missed some things....

There's a few things that I dont understand, or maybe I missed them entirely!

1. Was it ever explained what happened to the dinos on Isla Sorna?

2. Dr Wu died in a helicopter crash in JW. How is he alive and well in this one? That was never explained.

3. The years that have lapsed since the death of Hammond exceeds the amount of years since Maisie was cloned. So how can Hammond and Lockwood fall out over it since he was already dead?