Question

what is the main difference between bacteria and archa? they have a common ancestor?

Answer 1

archae are oldest living organisms,and are inhabiting most harsh conditions like swamp,marshes,hot springs etc,they have a different cellwall composition other than bacteria.because of their habitat,so they are different.

and they have a common ancestro,you can say 'progenote'.

Answer 2

archae IS bacteria.

Answer 3

yes,they are primitive bacteria.