Fish breathes through?

A. Gills. 

The unit for measuring the length of light waves is?

A. Micron

B. Millimicron

C. Angstron

D. All

Air is the best described as?

A. A mixture.

Chemical symbol of mercury is?

A. Hg

Which part of the human body produces bile?

A. Liver.

Light travels fastest in?

A. Vacuum.

pH of solution is defined as?

A. Hydrogen ion concentration

B. Log of hydrogen concentration

C. Minus log of hydrogen concentration

D. Molar hydrogen concentration

How does light normally travel?

A. In a straight line.