Biology / Unit 14 Bio 3745 short lesson, about 20 seconds
Invasive Species
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The idea
An invasive species is a non-native species that spreads aggressively and causes ecological or economic harm, often lacking predators or competitors that regulated it natively.
In practice
A predator introduced to an island with no native predators can devastate prey that evolved no defense against it.
Where people slip
A non-native species is not automatically invasive — "invasive" requires demonstrated spread and harm, not mere origin.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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