Why do astronauts on the moon seem like they’re “walking on springs,” while on Earth, we are firmly attached to the ground? Why are black holes black?

A black hole is an area of space with gravitational field sis front that nothing, not even light can escape. That’s why black jokes appear black

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.