The 1st one. Fertilizers are like food for plants, and that's what an algae is, sorta. Trout's don't eat algae and if there's too much algae around, it gets dirty and they eventually die because of the amount of bacteria in the algae. It's the same thing if you have a fish tank.
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A. Both describe ways a solid can change.
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No moraculos si a minha memoria não me trai acho temus 2tomos d carbono