The prickly pear is a cactus plant that was introduced into Australia.
The prickly pear cactus spread across the country.
To control the spread of the prickly pear cactus, a caterpillar was released to eat it.
What is the name of this type of control?

1 )
Biodiversity
Biological
3 )
Mutualism
4 )
Pesticide
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