What caused the mass extinction of placoderms at the end of the Devonian?
In: 9
1. Plants colonize land and forests begin to spread
2. Decomposition and runoff from those forests overfertilizes the ocean
3. Microorganisms eat up all the extra nutrients and die
4. Bacteria decompose those dead microorganisms and reproduce out of control, consuming oxygen and leaving the ocean hypoxic
5. Placoderms die off because there isn’t enough oxygen in the water for them to breathe
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