peristaltic heart

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Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

What’s the Difference Between Bison and Buffalo?

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Wolfgang Amadeus Mozart. Mozart rehearsing his 12th Mass with singer and musician. (Austrian composer. (Johann Chrysostom Wolfgang Amadeus Mozart)

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Black widow spider

9 of the World’s Deadliest Spiders

United States electoral college map showing number of electoral votes by state.

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Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

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peristaltic heart

biology

Learn about this topic in these articles:

circulatory systems

In circulatory system: Hearts
This type of heart is widely found among invertebrates, and there may be many pulsating vessels in a single individual.
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