Invasive Species
Non-native species introduced to ecosystems where they establish, spread, and cause ecological damage.
Real World
Grey squirrels introduced from North America to the UK in the 1870s have driven native red squirrels to near-extinction by outcompeting them for food and spreading squirrelpox virus.
Exam Focus
Always link invasive species impacts to specific mechanisms — competition, predation, or disease — not just 'they cause damage'.
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