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• The variety of life on earth's called biodiversity
• Within an ecosystem , animals compete for food, territory and mates
• Withina an ecosystem, plants compete for light,water,minerals and space
• Adaptations can Be structural (e.g., the spines of a cactus), behavioural (e.g.,penguins huddling together in a storm) or physiological (e.g.,antifreeze proteins in the blood of an icefish).