Variation
The differences between members of the same species - in size, colour, shape and much more. They come from genes, from the environment, and from mutations that add new versions of genes.
Depth 1 · Foundation
You can explain that no two members of a species are alike, and say whether a difference comes from genes, from the environment or from both.
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Foundation
You can explain that no two members of a species are alike, and say whether a difference comes from genes, from the environment or from both.
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What's still between you and Variation, depth 1, in the order you can learn it.