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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
Did you know?
Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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![General differences in food webs and carbon flow among terrestrial and aquatic ecosystems (adapted f](https://biology-forums.com/gallery/47/medium_33_17_02_12_7_03_55_20461713.jpeg)