How are organisms in the domains bacteria and archaea similar
a- they contain protists
b- they contain nuclei
c- they are multicellular
d- they prokaryotes

The correct option is D. Both bacteria and archaea are prokaryotes.

Explanation:

Prokaryotes are organisms made up of a single cell and do not possess any of the organelles which are bounded by a membrane. Prokaryotes can be classified into two categories: archaea and bacteria. Hence, option D is correct.

Other options are false because

Option A: Bacteria and archaea are not protists.

Option B: They do not contain a nucleus and their genetic material is present in the form of the nucleoid.

Option C: They are not multicellular.

[content deleted] - user123802726recklesschicken

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds