no offense, but have you guys ever used and explored a pc operating system? using this analogy, it has many services running that we dont know. some essential some are not. but their birth depends on what software we install. theyre packaged with it. they are there because apps need them in order to run. using task killers seem to do the freeing of the ram trick but it will make them reopen again every time an app needs it. some wont even run properly without it. task killers also consume additional battery power running on background imho.
Its easier to ask your brain first before posting (stupid)questions and waiting for (confusing)answers.