Viruses are very small organisms or living things. However, they at times don't seem to act like a living organism. Viruses grow and multiply only when they are inside living cells. Outside living cells, viruses do not change in any way. Viruses do not have the ability to reproduce themselves unless they are inside the cells of plants. animals or bacteria. Viruses are difficult to treat and are responsible for numerous diseases and illnesses.

1. A virus is ____ .

an organ
an organism
a plant
an animal

2. Organisms are ____ .

alive
not alive
fishlike
animallike

3. Viruses are ____ .

large
long
microscopic
warm blooded

4. Influenza is caused by ____ .

a virus
rust
cold rain
coughing

5. Viruses cannot ____ .

reproduce outside a cell
reproduce inside a cell
travel in the air
travel in water

6. Viruses ____ multiply.

do
do not
cannot
won't

7. Some viruses grow inside ____ .

bacteria
coal
rock
snow

8. Viruses do not change ____ a cell.

inside
outside
with
on

9. Sometimes we are given ____ to prevent viruses.

shots
candy
liquids
food

10. Viruses ____ cells in order to multiply.

eat
drink
use
shrink

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