Nautilus subtitulado - Contenido educativo
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Vídeo sobre la flotabilidad de Nautilus en inglés con subtítulos.
What set this line of mollusks apart from all that came before was a key evolutionary breakthrough, buoyancy.
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For years, its secret was a mystery, until scientists took X-rays of a living Nautilus.
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What makes Nautilus unique among the living mollusks today is that the shell is not a simple interior tube,
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but it is cut into a series of partitions.
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People began x-raying the animals, and early on it became apparent
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that not only is there air in the chambers, but there's water too.
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New chambers are sealed off with seawater still inside them.
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In order to stay buoyant as it grows,
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the nautilus must remove this seawater from its shell.
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To do so, it uses a tube called the siphoncle,
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which spirals through every chamber.
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Cells in this tube gradually pull the water into the animal's blood system, leaving only gas, the secret to maintaining buoyancy.
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500 million years ago, a buoyant shell enabled the nautiloids to grow in size and dominate the seas.
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- Idioma/s:
- Idioma/s subtítulos:
-
- Autor/es:
- Aurora
- Subido por:
- Aurora N.
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 6
- Fecha:
- 3 de junio de 2023 - 23:30
- Visibilidad:
- Clave
- Centro:
- IES LAS ENCINAS
- Duración:
- 01′ 53″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1280x718 píxeles
- Tamaño:
- 19.33 MBytes