Epithelium is the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures.
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The scientific method helps test and arrive at conclusions for a variety of hypotheses that are created when studying environmental science.
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Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple. Litmus can also be prepared as an aqueous solution that functions similarly.
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How is the hydrosphere changing? Human contributions to greenhouse gases in the atmosphere are warming the earth's surface – a process which is projected to increase evaporation of surface water and accelerate the hydrologic cycle. In turn, a warmer atmosphere can hold more water vapor