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the actions of the body's immune system that work to fight infections or disease.
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
a hormone that causes the secretion of gastric juices into the stomach.
parenchyma cells that are exposed to light and contain many chloroplasts. Chlorenchyma cells...
the outermost layer of the plant cell wall that forms the contact surface between adjacent plant...