In a stratified period of a lake, oxygen supplied directly by the atmosphere and photosynthetic organisms replenishes the dissolved oxygen of which of the following three choices: epilimnion (read as: eh-pi-LIM-nee-ohn), hypolimnion (read as: hy-p6e-LIM-nee-ohn), or thermocine?
EPILIMNION (ACCEPT: 2)