To breed together two animals or plants of different varieties or species to create offspring with combined traits.
From 'cross' (Old French 'crois') + 'breed' (Old English 'bredan'). This practice has been used in agriculture and animal husbandry since ancient times.
Ancient humans were crossbreeding plants and animals at least 10,000 years ago through selective breeding, essentially doing genetic engineering before anyone understood DNA—creating modern wheat, corn, and domesticated animals from wild ancestors!
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