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the double membrane that surrounds the lungs.
the growth of cities due to the influx of people from rural areas.
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
the spontaneous, passive movement of water molecules from an area of higher water concentration...
invisible, short-wave radiation emitted by the sun, which can cause cancer in humans.