A. 21.5
B. 23.5
C. 66.5
D. 90

A. north to south
B. east to west
C. south to north
D. west to east

A. 20
B. 22
C. 24
D. 28

A. right atrium
B. left-atrium
C. right ventricle
D. left ventricle

A. respiratory system
B. excretory system
C. Nervous system
D. None of above

A. femur
B. ulna
C. tibia
D. None above

A. cold-blooded
B. warm-blooded
C. non-hearing
D. egg-laying

A. kidneys
B. liver
C. Lungs
D. intestines

A. 1 to 2 liters of saliva per day
B. 1 to 1.5 liters of saliva per day
C. 1.5 to 2 liters of saliva per day
D. None of above

A. A four-chambered heart
B. Hair
C. Warm blood
D. a cerebrum