Only about one tenth of the cells in your body are ...
A. alive.
B. really you.
C. bacteria.
Bacteria are mostly ...
A. really helpful.
B. bad for humans.
C. neither good or bad.
Animals need bacteria to ...
A. fight diseases.
B. provide energy.
C. digest food.
You have ... cells in your body.
A. 7 million
B. 7 trillion
C. 7 octillion