[PatrickHenry]

I don't think creationism makes a positive statement about number four. [There must surely be at least one species, and probably several, having no genetic similarities with any other life on earth.]

True. But it's inferred. A weak inference, perhaps. If each species were a unique creation, there is no reason at all for each to be so similar to the others in their molecular structure.

[js1138]

They'd need to be similar so they could eat each other. No need, however to build this really neat branching tree of DNA.

[Genesis defender]

If each species were a unique creation...

Tsk tsk, Pat. You're getting sloppy. It's nitpicking, I know, but we creationoids prefer to use the term "kind", as in the dog kind. (Ex. - Wolves and dogs are separate species but can interbreed)