Use the drop-down menus to complete each sentence. are organisms that contain more than one cell with membrane-bound organelles and a nucleus.
Organisms that contain only one cell and do not contain a nucleus or membrane-bound organelles are known as
.

- Eukaryotes are organisms that contain more than one cell with membrane-bound organelles and a nucleus.

- Organisms that contain only one cell and do not contain a nucleus or membrane-bound organelles are known as prokaryotes.

Explanation:

According to their structural and functional complexity, organisms can be classified into eukaryotes and prokaryotes.

Some unicellular organisms are prokaryotic cells, like some parasitic microorganisms, such as amoebas.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

"a.) well–developed vascular system."