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trees, often closely-related trees, growing in exactly the same ground in exactly the same climate they have different-shaped leaves. Why?
You will also find that much of this is down to genetic variability. The internal coding of a particular species that would be inherited by its offspring (its genotype) holds all the instructions for the next generation. During the interpretation of this information various anomalies may occur and provide the variability that drives the evolution of the species. This is the phenotype, or the actual physical manifestation of the genotype. There does not actually need to be any environmental input to drive these "within group/species" differences in leaf shape and size at all - it can all be explained by this genotype ==> phenotype process.