Sure you can prove micro evolution

Now prove macro evolution, evolution from one species to another.  Are frogs the only thing you can use to say aquatic things moved on land?

Ring species show changes in similar organisms like birds, but not a change from one kingdom or class to another.  Why say we are descended from chimps if chimps are descended from something earlier?  If we can trace the evolutionary tree of mammals back to something like mammal-like reptiles, why not say we came from Sauropsida or prior?