Excess oxygen gas from photosynthesis builds up in this mixed layer and is subsequently released into the atmosphere.
(Excess oxygen gas from photosynthesis; builds up; L:in this mixed layer) (Excess oxygen gas from photosynthesis; is released; into the atmosphere; T:subsequently)
Excess oxygen gas from photosynthesis Excess oxygen gas from photosynthesis
builds up is released
L:in this mixed layer
into the atmosphere T:subsequently