Q: this photo shows such a horn with 2 stotzel(piston) valves. the horn is probably made c 1846 by the instrument maker thomas key from london.

A: This photo shows such a horn with 2 Stotzel(piston) valves. The horn is probably made c 1846 by the instrument maker Thomas Key from London.
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Q: study of the effect of singing birds, plants also apply to human beings, because our ancestors, from the earliest periods of history, lived in an environment where they could always hear the birds singing.

A: Study of the effect of singing birds, plants also apply to human beings, because our ancestors, from the earliest periods of history, lived in an environment where they could always hear the birds singing.
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Q: 2.605,00 usd = 1.600,00 usd cambridge preparation - cpe + 200,00 usd school's administrative fee + 805,00 usd (student house)

A:
2.605,00 USD = 1.600,00 USD Cambridge Preparation - CPE + 200,00 USD School's administrative fee + 805,00 USD (Student House)
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