Can someone please help me out !!!

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?