What is an Invasive or Exotic Species?

According to Executive Order 13112, which was signed on February 3, 1999 by President William Jefferson Clinton and established the National Invasive Species Council, an invasive species is defined as fulfilling these two characteristics:

1) Non-native to the ecosystem under consideration and

2) whose introduction causes or is likely to cause economic or environmental harm or harm to human health.

An Alien, or exotic species is defined by Executive Order 13112, with respect to a particular ecosystem, as:

Any species, including its seeds, eggs, spores, or other biological material capable of propagating that species, that is not native to that ecosystem.

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