Answer:
Earth has four 'spheres,' called the geosphere, hydrosphere, biosphere and atmosphere. These spheres each have unique properties and features, but they are not isolated on Earth, and they work together to drive the processes of the planet. ... These interactions are essential to life on Earth Interactions also occur among the spheres. For example, a change in the atmosphere can cause a change in the hydrosphere, and vice versa. ... Water in the lake (hydrosphere) seeps into the cliff walls behind the dam, becoming groundwater (lithosphere), or evaporating into the air (atmosphere).
Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), 
"biosphere" (living things), and "atmosphere" (air). ese spheres are closely connected. For example, many birds (biosphere) fly through the air (atmosphere), while water (hydrosphere) often flows through the soil (lithosphere). In fact, the spheres are so closely connected that a change in one sphere often results in a change in one or more of the other spheres
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Answer: measure
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Bar is a musical term that means the number of beats that is being played at a particular time period and at a particular tempo. 
A bar is simply a measure thatnis used in music and every bar consist of identical beats. Therefore, the answer to the above question will be option D "measure".
 
        
             
        
        
        
East Sussex England 
hope that helps
        
             
        
        
        
Answer:
Western music: Ars Nova. When the influential treatise Ars Nova (“New Art”) by the composer Philippe de Vitry appeared early in the 14th... These innovations, which were anticipated to a degree in the music of Pierre de la Croix (flourished last half of 13th century), are marked by the emancipation of music from the rhythmic modes (dominated by triple metre) of the preceding age and by the increased use of smaller note values.
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