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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Illicit drug use costs the United States approximately $181 billion every year.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Geographic distribution of early hominins. Geographic distribution of early hominins.
Touch the test light to the negative (–) terminal of the battery or a good engine ground to check ... Touch the test light to the negative (–) terminal of the battery or a good engine ground to check ...
Cover test Cover test
Near-uniform distribution of nesting seabirds Near-uniform distribution of nesting seabirds
Global Distribution of Biomes Global Distribution of Biomes
Mendel’s test cross to verify independent assortment Mendel’s test cross to verify independent assortment
Video: Lower Limb Arteries Animation

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