| A | B |
|---|
| prokaryote | an organism that lacks a true nucleus in the cell. |
| eukaryote | an organism with cells that contain defined nuclei |
| virus | any of the small particles that invade and then replicate inside a living cell |
| bacteria | prokaryotes whose genetic material is not contained in a nucleus |
| host | an organism that provides a source of energy for a virus or another organism to live |
| parasite | an organism that lives on or in a host and causes harm to the host |
| autotroph | an organism that produces its own food |
| heterotroph | an organism that cannot make its own food |
