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P

Product

a substance that is made during a chemical change

Properties

the characteristics of a substance

protein

food needed for growth and repair of tissues, also used to make enzymes.

Pyramid of numbers

a diagram showing the number of organisms at each level of a food chain

R

Ray diagram

diagram that shows which way light rays travel

RDA

suggested amount of each nutrient which is needed daily to stay healthy.

Reactants

substances that react together during a chemical change

Red blood cells

cells in the blood which carry oxygen around the body

Reflected ray

light ray that bounces off a surface

Reflects

light bounces off a surface


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