Suppose the milky way galaxy were truly isolated and that no other galaxies existed within 100 million light-years. suppose that galaxies were observed in larger numbers at distances greater than 100 million light-years. why would it be more difficult to determine accurate distances to those galaxies than if there were also galaxies relatively close by?

Ibelieve the answer is b

Multiply the 3 dimensions, assuming it is a rectangular cuboid, to get the volume in cm³ divide mass by volume to get density in g/cm³

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(b) 60 miles per hour;