SI units are a modern form of the metric system.
Answer: One difference is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. Another difference is that eukaryotic cells have many membrane-bound organelles while prokaryotic cells have no membrane-bound organelles.
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El sistema de nomenclatura binominal identifica a una especie inequívocamente, pues no puede haber dos especies diferentes con el mismo nombre y evita la pluralidad de nombres comunes con el que se la pueda conocer según el idioma o región, que además pueden nombrar a más de un taxón diferente.
Water evaporates from the ocean and land surfaces, is held temporarily as vapour in the atmosphere, and falls back to Earth's surface as precipitation. ... Water that infiltrates Earth's surface becomes groundwater, slowly seeping downward into extensive layers of porous soil and rock called aquifers.
Choice #1 & Choice#4 I believe
