Potential answers for "They produce much of Earth's oxygen"

⭐⭐⭐⭐ OCEANS
⭐⭐⭐ SEAWEED
⭐⭐⭐ AIR
⭐⭐ PRATERS
⭐⭐ BLACKANDWHITE
⭐⭐ EGOISTS
⭐⭐ ICEPICKS
⭐⭐ IRON
⭐⭐ RAREGASES
⭐⭐ HOES

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