Practice problem
What is the primary difference between the photic and aphotic zones?
There is more oxygen available in the aphotic zone than in the photic zone.
The pH of the water is higher in the aphotic zone than in the photic zone.
Sunlight reaches the aphotic zone but not the photic zone.
Sunlight reaches the photic zone but not the aphotic zone.
Type a concept, like “slope” or “photosynthesis”.
