Column A
1.
tiny, single-celled organisms with no nucleus inside the digestive track:
tiny, single-celled organisms with no nucleus inside the digestive track
2.
no cells, takes over a host cell from which it replicates and spreads into neighboring host cells:
no cells, takes over a host cell from which it replicates and spreads into neighboring host cells
3.
multicellular organisms made up of cells that have cell walls and well-defined nuclei:
multicellular organisms made up of cells that have cell walls and well-defined nuclei
4.
an organism that lives in or on another organism and takes nutrients at the expense of the host.:
an organism that lives in or on another organism and takes nutrients at the expense of the host.
Column B
a.viruses
b.fungi
c.parasite
d.bacteria
1. d. bacteria
2. a. viruses
3. b. fungi
4. c. parasite