Which cells contain a nucleus and membrane-bound organelles?
a. prokaryotic
b. eukaryotic
c. archaean
d. cyanobacteria

The correct answer is Option B.

Explanation:

Prokaryotic cells are defined as the cells which does not contain any membrane bound organelles nor they contain nucleus. They are single-celled organisms. For Example: Bacteria, archaea

Eukaryotic cells are defined as the cells which contain membrane-bound organelles. These cells also contain nucleus and also they have DNA which is contained in the nucleus. They can be single-celled or multi-celled organisms. For Example: Animal cells, Plant cells.

Archaea and cyanobacteria are the examples of prokaryotic cells and thus, will not contain nucleus or any membrane-bound organelles.

Hence, the correct answer is Option B.

the answer is c.the valence of the atoms combine .