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birds without a keel on their breastbones and therefore unable to fly, for example ostriches.
nutrients are obtained by digesting organic compounds that have to be acquired and ingested by...
undifferentiated cells found in almost all organisms that have the ability to develop into any...
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
(also called yellow cartilage) type of cartilage that contains many yellow elastic fibres lying...