Answer:
Option A, B and C
Step-by-step explanation:
Both the archaea and bacteria belong to family of species (prokaryotes) which are unicellular and with simple body structure. Thus option B is correct
Both the archaea and bacteria are able to live in any environmental condition and hence they would be able to live in extreme environment also. Thus option A is correct
Since these two species of organisms are unicellular they mainly reproduce by forming spores through binary fission. Hence, Option C is also correct.
Both the archaea and bacteria are the oldest form of species on planet earth and hence Option D, is incorrect.