Aquatic species are more comfortable in cold water because __________

i). as the temperature decreases, the solubility of dissolved oxygen increases.

ii) as the temperature increases, the solubility of dissolved oxygen increases.

iii) as the temperature increases, the solubility of dissolved oxygen decreases.

i) as the temperature decreases, the solubility of dissolved oxygen increases.

Dissolution of oxygen in water is an exothermic process which means that heat is released in this process. This is known that for exothermic processes, solubility increases with a decrease in temperature. Also, on heating, the gas molecules gain energy and try to escape out. That’s why when temperature decreases, the solubility of oxygen in water increases due to which the net dissolved oxygen increases which makes aquatic species more comfortable.