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substance that causes an allergic reaction.
blood vessels that transport deoxygenated blood from the heart to the lungs.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...