The structure of the skin is an effective barrier against bacteria. The multiple layers of epidermis, while can be invaded by foreign organisms, has a high turnover rate which means it is constantly shedding, therefore even the bacteria is shed protecting the body. Lastly, the skin's lipids maintain an acidic pH which slows and stops growth and replication of bacteria.
Excess Nitrates in the water supply
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B. separating strands of DNA
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The true statement is: The Sun's energy passes through the atmosphere without warming it significantly.
