Answer:
Its CO2
Explanation:
All marine organisms use oxygen for respiration, which releases energy from carbohydrates and has carbon dioxide and water as byproducts
If the concentration of sodium outside the cell is more than inside , so to take out the sodium , ATP is used as the cells has to work against concentration gradient !
You can see this in Neurons as a example ! There is sodium pump to throw sodium out of cell !!
B. Solar system galaxy universe Earth
