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Animal Reproductive Strategies The ultimate goal of each species is to produce the maximum number of surviving offspring using the least amount of energy. This is called the reproductive effort. Asexual reproduction is energy efficient (low reproductive effort) as it involves only one animal. Sexual
Plants make their own food and are called autotrophs. Animals must consume other organisms and are called heterotrophs. This difference classiï¬ es plants and animals into two separate groups.Method of reproduction can be used to classify organisms into even smaller groups. The two main reproductive methods are asexual and sexual reproduction.