Environmental - this refers to variation caused by the world around an organism., Variation - this word means the difference between individuals of the same species., Natural - This type of selection is the driving force behind evolution., Evolution - This describes how new species are formed by gradual changes over many generations., DNA - This is the chemical in our bodies that stores your genetic code., Genes - these are lengths of DNA that code for a particular characterisitc., Nucleus - This is the part of a cell that stores the DNA., Sperm - This is the name of the male sex cell., Fertilisation - This describes when a sperm and egg cell fuse together., Darwin - this is the name of the scientist that proposed the idea of evolution., Modified - organisms that have had there DNA deliberatly changed are desribed as being genetically m_______?, Extinction - this describes the complete loss of a species from an area., Biodiversity - this describes the whole range of living things that can be found in an area., Chromosomes - these describe long coils of DNA that contain many genes,, there are 23 pairs of these in humans., Offspring - The scientific name for an organisms children. ,

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