mechanic, mechanic, mechanically, mechanized etc.

[petarcamuset]

Hi, Is there anyone who can fill in the blanks and possibly explain jaust a bit why one and not the other term? Thank you.
Fill in the blanks with: mechanic, mechanism, mechanize, mechanical, mechanically, mechanistic, mechanics, mechanization, mechanized.

a. Today´s computers are less_________ than they used to be.
b. The _____________ devices in a computer system operate more slowly than the electromagnetic devices.
c. The _________ of the brain is very complicated but unlike a computer it isn´t ________ .

[Niall]

Heres the words I would use:
a. mechanized - with machinery, in this case the sentence would mean "they have less machinery in"
b. mechanical - mechanical objects are objects that are machines. In this case, the sentences compares old machine based systems with new electromagnetic based systems.
c1. mechanism - a mechanism is something made up of working parts, such as the brain.
c2. mechanized - with machinery. In this case, its saying the brain doesn't have machenery in, where as a computer does.

I can explain this futher if you like. In some cases there is more than one plausable option, but I think i have chosen the most semantically plausable.