Genes - In the nucleus of the cell, chromosomes - Bits of genes, alleles - Different version of the same genes, carrier - Has recessive allele but does not show symptons of disease, pollutants - Dangerous chemicals in the air, outlier - Odd one out, combustion - Burning, catalyst - Speeds up a reaction but remains unchanged, galaxy - Thousands of millions of stars, comet - Rocky lump, orbits the Sun, parallax - Apparent shift of object against a background, light pollution - Created by humans - stops us seeing bright stars,

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