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Vaccines prevent between 2.5 and 4 million deaths every year.
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There are more sensory neurons in the tongue than in any other part of the body.
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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.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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The average adult has about 21 square feet of skin.
![Sexual swellings are one way for females to advertise their mating availability, thereby inducing ma](https://biology-forums.com/gallery/47/medium_269691_26_01_15_5_55_23_204361867.jpeg)
![(a) Male competition can be fierce. (b) This male baboon has bite wounds suffered in competition wit](https://biology-forums.com/gallery/47/medium_269691_26_01_15_5_55_25_204431297.jpeg)