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the first part of the intestine, from the pyloric valve of the stomach to the caecum. It consists of the duodenum, jejunum and ileum.
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
irreversible disease where the alveoli are damaged, resulting in breathing difficulties.
small fluid-filled sacs that store, transport, or digest cellular products and waste.
blood vessels that transport deoxygenated blood from the heart to the lungs.