The smallest unit of life is:
A. Atom
B. Molecule
C. Organ
D. Cell
Which gas is used in balloons to make them float?
A. Oxygen
B. Helium
C. Nitrogen
D. Hydrogen
The process by which liquid turns to solid is called:
A. Evaporation
B. Freezing
C. Condensation
D. Melting
Which blood vessels carry blood away from the heart?
A. Veins
B. Capillaries
C. Arteries
D. Venules
Which organ produces bile?
A. Pancreas
B. Stomach
C. Liver
D. Gallbladder
Lightning is an example of:
A. Static electricity
B. Electric discharge
C. Current electricity
D. Magnetic field
The human body has how many lungs?
A. 1
B. 2
C. 3
D. 4
Which vitamin is found in citrus fruits?
A. Vitamin A
B. Vitamin D
C. Vitamin C
D. Vitamin K
Which element is needed for healthy bones and teeth?
A. Sodium
B. Calcium
C. Potassium
D. Iron
The process by which plants release water vapor is called:
A. Translocation
B. Transpiration
C. Evaporation
D. Condensation