Ozone would be the secondary pollutant because it is caused when two primary pollutants react. Hope this helps!
Algae and ferns are plants "plantae" the have chloroplast which is used in photosynthesis resulting in the plants being green
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The density of a liquid determine if it will float or will in another liquid. It will float if it is more dense than the liquid it is placed in
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I am 100% sure it is the mudstone. I believe they are the oldest rock in existence.
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