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18.5 Pacemaker cells trigger action potentials throughout the heart: Human Anatomy and Physiology

Немецкий язык

Die Hand Deutsch Wortschatz Grammatik

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Some common examples for the use of various time prepositions.

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The universe made stars at a fast rate 10 billion years ago, but the universe's use of hydrogen and helium was very low. Today, star birth is happening at a much slower rate but there is so much leftover gas that the universe will keep creating stars and planets for a long time to come...The observational evidence for the big bang and cosmic evolution will be all but erased away 1 trillion years from now.Any far-future civilizations will be clueless about the universe's birth and evolution.

Chambre à l'esprit nature