Which statement about the universe is not correct? a) each galaxy contains billions of stars. b) the universe contains billions of galaxies. c) you may not see all stars with the naked eye. d) each solar system contains billions of galaxies.

D) Each solar system contains billions of galaxies

Think, there are no other galaxies from the sun to Pluto (not a planet but still in our solar system) and the answer said EACH solar system and, a Galaxy contains solar systems not the other way around.

How many calories in food

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.