Organisms are classified into domains and other groups by similar characteristics. There are three domains: Archaea, Bacteria, and Eukarya. Which of the following characteristics is used to classify organisms into domains? genetic similarities

similarities in habitat

presence or absence of a nucleus

presence or absence of photosynthesis

presence or absence of a nucleus

Explanation:

These classification of organisms into broad domains is based on the present or absence of nucleus in the cell of an organism.

The archaea are prokaryotes and they lack a distinct cellular nuclei.

Bacteria are similar to archaea but bacteria have only one RNA polymerase

Eukarya have true nucleus and membrane bound organelles .

So, the variations in their cells are used to classify organisms into the broad categories

the correct answer is:

a. formation of precipitation