By Alisha John
BREAKING:Planet Earth is under attack by alien species from out-of-place. They may be lurking in your backyard right now. These invasive species take many forms – from plants to fish to mammals. But one thing is certain: they threaten the delicate balance of our native ecosystems.
Invasive species threaten native ecosystems and wildlife
As defined by Executive Order 13112 signed by President Clinton in 1999, an invasive species is an alien species which causes harm or is likely to cause harm to the environment, economy, or human health.