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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Atlatl mammoth ivory "creeping hyena", found in La Madeleine rock shelter, dated back to c Atlatl mammoth ivory "creeping hyena", found in La Madeleine rock shelter, dated back to c
Anterior and Posterior Cervical Triangles Anterior and Posterior Cervical Triangles
Human body cavities and membranes Human body cavities and membranes
Dermatomes of body, anterior view Dermatomes of body, anterior view
Electrolytes in Body Fluids Electrolytes in Body Fluids
A wide variety of pathogens may live on or in the human body. A wide variety of pathogens may live on or in the human body.
Video: DNA Replication Factory and Protein

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