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A

Absorb

when living cells or blood take in food or oxygen

Absorbs

light energy hits a surface and is converted into heat energy

absorption

what happens when digested food particles pass from the digestive system into the bloodstream.

Accumulate

to build up

Accumulation

the process of building up or gathering together

acidic

has a pH less than 7, for example stomach acid.

Adaptations

changes to organisms which allow them to survive or to do their job

Aerobic respiration

glucose from food reacts with oxygen to produce energy

alkaline

has a pH greater than 7.

Alveoli

air sacs in the lungs where gaseous exchange happens

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