Good groups, but it suffers from two of the groups being almost completely interchangeable. Mars, Venus, Jupiter, Neptune, Uranus and Saturn can all fit into two of the groups, and there's no way to tell which should be in which, so there's not a unique solution.

Doesn't accept 'bear', 'planet', 'god' or 'china'. So no idea what you've put as the acceptable answers.

FAKE!

In addition to the problems mentioned by Robert Crawley, the Chow chow is a breed , whereas the others are species. Also I think you mean "can precede" not "can be preceded by" for the sloth / moon etc. row. I have never heard of a "bear sloth" but I have heard of a "sloth bear"