And everything else changed, imitating and following on the condition of the universe, and in particular, there was a change to the mode of conception, birth and rearing, which necessarily imitated and kept pace with the change to everything; for it was no longer possible for a living creature to grow within the earth under the agency of others' putting it together, but just as the world order had been instructed to be master of its own motion, so too in the same way its parts were instructed themselves to perform the functions of begetting, birth and rearing so far as possible by themselves, under the agency of a similar impulse.