I imagine that biodegradation and bioremediation overlap a lot, because a lot of remediation involves degrading materials.But some remediation would involve other things, such as removing heavy metals from water. Maybe there are microorganisms that can concentrate heavy metals into themselves, thus removing them from water.
I'm not totally sure about that, but I would guess that biodegradation is the deconstruction of unwanted chemicals by organisms, and that bioremediation is a more general term for environmental remediation by biological agents. However, there may be a technical meaning for these that I do not know.
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