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Key Word Description
Active Transport In active transport cells use energy to transport substance through cell membranes against a
concentration gradient.

Aerobic respiration Aerobic respiration breaks down glucose using oxygen to make energy available for chemical
reactions in cells.

Agar jelly A jellylike substance used to grow microorganisms.

Alveoli The…

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Double circulation A circulatory system where the blood passes through the heart twice ­ once through the body and
once through the lungs.

Ethanol The chemical name for alcohol produced by the fermentation of sugar by yeast.

Fermentation Breakdown of food by microorganisms that does not require oxygen.


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