Answer:
Increasing the amount of carbon dioxide from breathing decreases the amount of oxygen which in result will make it harder for deep sea animals to breath.
Step-by-step explanation:
Respiration is the act of breathing and when you breath you are exchanging carbon dioxide with oxygen for your lungs. Although respiration is different for sea creatures because they have gills, increasing the amount of carbon dioxide and decreasing the amount of oxygen will make it harder for these animals to breath.
Hope this helps.