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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

Evolutionary adaptation to a new environment via natural selection. Evolutionary adaptation to a new environment via natural selection.
Overview of gas exchange between the environment, blood, and cells. Overview of gas exchange between the environment, blood, and cells.
These young children are taking the initiative to explore their environment as they examine a snail These young children are taking the initiative to explore their environment as they examine a snail
Environment Environment
From your experiences in grade school, can you tell if or how your teachers unintentionally helped ... From your experiences in grade school, can you tell if or how your teachers unintentionally helped ...
Human Activities and the Environment Human Activities and the Environment
Video: Introduction to Insulin

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