Underwater plants and algae also contribute oxygen that is given off during the process of photosynthesis (green plants using the sun's energy to make their own food).
(Underwater plants and algae; contribute; oxygen that is given off during the process of photosynthesis (green plants using the sun's energy to make their own food)) (oxygen; is given off; T:during the process of photosynthesis (green plants using the sun's energy to make their own food) (green plants; using; the sun's energy; to make their own food)
Underwater plants and algae oxygen green plants
contribute is given off using
oxygen that is given off during the process of photosynthesis (green plants using the sun's energy to make their own food)
T:during the process of photosynthesis (green plants using the sun's energy to make their own food
the sun's energy to make their own food