Ah, poops! After they are combined, they’ll drop poops! (Grow more plants, they can absorb poops...)
You are the creator in mysterious biochemistry lab! From trilobite of Cambrian Period to dinosaur of Cretaceous Period, and saber-toothed tiger of Kainozoic era, you can create any species you want. All kinds of mysterious liquid medicines and magic mushrooms will help you to finish final evolution.