A standard contains a known amount of a substance. If u are performing an experiment you will use a sample with a known concentration to create a standard curve (a straight line). Positive and negative controls are measured against the standard curve to show the expected results if the sample u will be testing is positive or negative.
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cancer diagnosis because it is more serious than the rest
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In the testicles sperm is produced in coiled structures known as seminiferous tubules The epididymis runs along the top of each testicle. This is a cord-like structure where sperm develop and are stored. When the penis fills with blood and gets erect the release process begins.
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Explanation:
Food and Drug Administration and <span>Centers for Disease Control and Prevention </span>
