Humans chose the transistors, the number of transistors and what the output should look like. That is all part of what you call design specifications.
What pressured dead mud to come to life? The "prebiotic soup" where life is supposed to have originated had an unlimited number of particles that could have binded in any way possible to them. To expect life to start like that is to think that a computer program connecting any number of random components in a random way will make a working and useful and complicated electronic device somewhere along the line, like a computer or a cellular phone.
Without intelligent human beings to guide such a program it will never produce anything worth while.