Which characteristic is unique to archaebacteria?

they are prokaryotic with no nucleus.
they are single-celled organisms.
they can live in extreme environments.
they are the only bacteria that cause illness.

ill mark brainliest

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i