Toxic residues accumulate in ecosystems more in higher order organisms in the food chain. This is because most of the toxins will accumulate in a dump and release back to the environment (e.g., accumulated in the fat of organisms received, etc.) and high-step sequence in creatures often have to eat the creatures in the series is more than the amount that is lower than it would be enough, because there are often larger than the victim, such as a sprain has been eating toxins are each 1 unit, but the sprain is fish good feeding. Must eat ten steps the sprain? Therefore, one of the fish toxin to ten units. Birds that eat fish, it may need to eat fish, the ten. One bird per bird, it has lucrative toxins into ten times, etc.
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