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S

Sample

the measured area used for sampling

Sampling

method for estimating the population size

Scattered

disorganisation of light

scurvy

disease caused by a lack of vitamin C in the diet

Secondary consumer

the second animal in a food chain; it always eats the primary consumer

Sedimentary rocks

rocks formed from deposited rock fragments

Sediments

fragments of broken rock that have been deposited

Sexually transmitted disease

microbes passed onto others during sexual intercourse

Shadow

area of darkness where light is blocked by an object

sickle-cell

Inherited disease which affects anaemia the ability the blood has to carry oxygen

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