About a trichordates I can agree.
As well as for many other creatures... Unfortunately, currently there are no biologists among developers of the game in question...
About animal and plants I can only add to what Llamabeast said that there are some groups which could be named both plants and animals - these are monocellular green algae/ Flagellata. Of these, some species carry chloroplasts and are autotrophic, while others aren't. This can change even before our eyes. On the other hand, Fungi are quite removed from both plants & animals (using, of course, classic definitions), though less so than bacteria. It IS possible that plants appeared before fungi, but it's also possible that fungi group was removed from plant-animal line before the latter split.
Considering appearance of autotrophy the most accepted currently point of view is that the first living beings were heterotropic and used for food organic substances which were accidentially synthetized in conditions of ancient Earth. Later some procariots "learned" to make their own organic substances: some of them used chemical energy, but others used an energy of solar light - which in some cases have given an output of oxygen that's toxic for most anaerobic bacteria. Later some of them learned to not only survive, but thrive in oxygen-rich conditions, using oxygen for more full destruction of components of their food, giving in turn more energy. And still later some lifeforms began to "cooperate" with others, including smaller organisms in their cells as symbionts - such as chloroplasts contained in many cells of modern plants (this is the most accepted currently point of view). Of course, this is very telegraph-style...
