La figura consiste de dos masas m1 y m2. Si el sistema se mueve libremente y la tensión de la cuerda es 40N y m2= 9kg. Calcular el l valor de la masa m1. Usar g= 9,8m/seg2 Esto es de leyes de Newton

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;