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resonance frequency
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Bats have special resonating structures attached to their sound-producing organs that select specific sound frequencies. This enables them to use different sound signals in different contexts.
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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
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Normandy Invasion: Omaha Beach. World War II. D-Day. Infographic. SPOTLIGHT VERSION
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resonance frequency

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