Anonymous

Down would have non-survival consequences.

Anonymous

Animals mutate down to all the other sub-species or evolve up to all the other sub-species defend on the state of mind of that animal.

Anonymous

There is no original base for all animals. Even today, virus mutate to defeat the human defense. All organisms adapt to their environment and thus mutate. The base changes with the environment, and the rule is survival of the fittest.

Anonymous

"Up" and "down" have no meaning here.