Methods used to control invasive species

Territorial surveillance, International waters, Necessary eradication

Explanation:

TS:

Resources are made available to protect, track, and eradicate invasive species through careful monitoring of territories.

IW:

Ships take on ballast water to aid in stability. New laws and legislation are put in place to prevent them from taking water (and organisms) from one location on the globe, and then dumping it in another.

NE:

We kill invasive species through incentivizing hunting, or other means.

currents is the correct answer.