bilateral animals on earth the largest number of animals that you'll recognize as animals are bilateral they have all left side or right side and the front and back so this is apparently the basic plan of all nervous systems all the biological brains are like this why probably the first purpose they served was propulsion. the new technology for allowing research was to look deep into the structure of the brain. results of the connect own project show that the brain despite the dizzy and complexity of its circuits is put together in a way that's highly structured and almost mathematical.