Internal structure - something inside the organism, External feature - trait on outside of organism, Adaptation - trait to help organism survive in its environment, Variation - change or difference, Function - job or purpose, Structural adaptation - physical feature that an organism has to survive, Behavioral adaptation - something that the organism does to survive, Natural selection - organisms with favorable traits survive and reproduce, Favorable - good and wanted, Increase - greater or more, Decrease - smaller or less, Trait - characteristic, Camouflage - adaptation that helps an organism blend in with environment, Xylem - structure within a plant that transports water from the soil, Selective breeding - humans choose parents to reproduce to create offspring with desired traits,

Variation

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