Which statement best explains why each river has its own set of characteristics a river supports different organisms depending on where it flows be a river absorbs oxygen from the atmosphere as a close down hill see rivers interact with the Eco systems theory which they pass de rivers flow downhill pulled by gravity toward the sea

chordata is the answer

not sure if this what   you'r looking for would be percent composition

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.