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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Cyanide works by making the human body unable to use oxygen.
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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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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Helpful AA summary
Adolescence is a key period for the development of lifelong interests and career paths.
Summary of Hale’s Lactation Risk Categories
Eco-Development Projects
Infant and Toddler Development and Responsive Program Planning: A Relationship-Based Approach