Invasive means that this animal or plant is invading Australia
e.g it could be wrecking fences. Non invasive means its doing no
harm at all e.g the cow is non invasive becaause its not doing
anything wrong, its actally helping us by giving us milk!
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An invasive animal
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The opposite of invasive is non-invasive, leave alone, surrender, withdraw or yield, depending on the conext.