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birds without a keel on their breastbones and therefore unable to fly, for example ostriches.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
a clear, colourless solution of hydrogen chloride (HCl) in water. It is a strong and highly...
a biological membrane that separates the interior of all cells from the outside environment.
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...