Fish breathes through?
A. Gills.
Mass divided by volume is called?
A. Density.
Hydrogen was discovered by?
A. Henry Cavendish.
Air is the best described as?
A. A mixture.
A normal pulse rate per minute for healthy adult at rest ranges from?
A. 60 to 100 beats per minute.
The brain of computer is?
A. Microprocessor (CPU).