Answer:
Remaining the same
Explanation:
By the Lavoisier's principle the matter can't be created nor destroyed, but always transformed.
It means that in an ecosystem, the matter, and also the energy, is not increasing and not decreasing, the total amount remains the same, but in different forms.
Answer is in a photo. I can only upload it to a file hosting service. link below!
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O is what should go in the blank. O stands for Oxygen.
This it true because in the triangle of the transformation from solid, liquid, and gas
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