Each organism has a job in a community
Laboratory helps you identify things rather than the others using controlled variables
Out of all of the choices to be made, the Archaea and bacteria both can keep their DNA in the form of a nucleoid in common.
Yes, this is true, and it is actually one of the organisms driving evolution! Some organisms develop mutations that are actually beneficial (better eye-sight, for example) and they're more likely to pass those to their children that individuals without those mutations!