Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.

The Fahrenheit scale is used for measuring temperature in the British system. The metric system uses the Celsius scale.

Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.

In the liquid state, molecules flow freely around each other and exist at a higher temperature range than the same substance in a solid state. Liquids maintain a constant volume but their shape depends upon the shape of their container.

An element is matter than cannot be separated into different types of matter by ordinary chemical methods.