Explanation

A vertebrate is an animal with a spinal cord surrounded by cartilage or bone.

  Vertebrates include birds, fish, amphibians, reptiles, and mammals.

Explanation

Acetic acid (CH3COOH), also called ethanoic acid, the most important of the carboxylic acids. 

Explanation

When magnets are used in magnetic therapy, the poles are often referred to as being positive or negative.

Explanation

The equator receives the most direct sunlight because sunlight arrives at a perpendicular (90 degrees) angle to the Earth.

Explanation

The amount of water vapor in the air is called absolute humidity.

The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity.