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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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There are approximately 3 million unintended pregnancies in the United States each year.

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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

Abiotic factors influence population densities. Abiotic factors influence population densities.
Environmental factors restricting the distribution of Chthamalus to the upper intertidal zone. Environmental factors restricting the distribution of Chthamalus to the upper intertidal zone.
Rusty-tipped Page (Siproeta epaphus), Butterfly World (Florida) Rusty-tipped Page (Siproeta epaphus), Butterfly World (Florida)
Richard Spruce Richard Spruce
Selected biological, psychological, and sociological factors in the development of personality ... Selected biological, psychological, and sociological factors in the development of personality ...
Structures of four common types of DNA-binding motifs from eukaryotic transcription factors Structures of four common types of DNA-binding motifs from eukaryotic transcription factors
Video: Neural regulation of blood pressure - baroreceptor and chemoreceptor reflexes

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