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a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by absorbing harmful ultraviolet radiation.
semi-liquid mass of partially digested food and gastric juices, produced in the stomach.
the process whereby water and small molecules dissolved in the blood are forced out of the...
neurons that have two outgrowths coming directly from the cell body.
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...