Final answer:
Bioaccumulation occurs when an organism absorbs a toxic substance at a rate faster than it can eliminate it through excretion and catabolism.
Step-by-step explanation:
When an organism absorbs a toxic substance at a rate faster than it can eliminate it through excretion and catabolism, it leads to bioaccumulation. Bioaccumulation occurs when the organism accumulates the toxic substance in its body over time. This can happen when the substance is present in the environment and the organism is unable to get rid of it efficiently.
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