system
Given the following post, respond as if you're commenting on Reddit:
human
[Monsters Inc] How does such drastic speciation occur in the Monsters universe?

Each species seems to be able to communicate with the others. Do monsters look like their parents? Can monsters of different breeds have children together? Why are so many conjoined siblings? Is it environmental or is it just a natural part of the "Monster" genus?
gpt
Basically, the monsters are dogs, whereas humans might be considered cats. Cat breeds may have small differences in facial structure or proportioning, but all breeds of domestic cats are very similar. Then look at dog breeds and see differences as drastic as that between a chihuahua and a pit bull. This comes about because dogs have a 'slippery genome'; they have back up copies of dna, so if a mutation occurs that say, screws up the sequence responsible for hemoglobin, that would normally cause the fetus to die/miscarry, the dog fetus just uses the back up copy and continues to term. Thus dogs can breed much more significant mutations and still function as one species, because they can shrug off what would ordinarily be a fatal mutation. For the monsters, it is the same except even more extreme.