The lake on titan was evaporated, it evaporated because at that time titan was going through summer.
As populations are the smallest unit that actually evolves, it is reasonable to call them the "unit of evolution"
<span>The plan of the sponges suggests that, if animals did arise from colonial protists, that they can and will evolve into animals again in the future. Since protists are grouped in a colony and combine to make one organism, there is a possibility of endless capabilities out there for different and new animals that could potentially become a realization.</span>
