The water of Lake Laberge, in Canada, currently contains high levels of the pesticide toxaphene. ███████████ ███ ███████ ███████ █████████ ███ ██████ ██ █████ ███████ ██ ███ █████ █████ ███ ███ ██ ████ ████ ██ █ ███ █████ █████ ██ ███ ██████
Why does Lake Laberge, in Canada, contain high levels of toxaphene when toxaphene was banned in North America in the 1980s and is now used only in a few other parts of the world?
The correct answer must help explain why Lake Laberge contains high levels of toxaphene even though the substance was banned in Canada in the 1980s. The correct answer will either discuss how toxaphene from the past has remained in the lake, is still being produced in or near the lake, or is being introduced to the lake from somewhere else.
Which one of the following, ██ █████ ████ ████ ██ ███████ ███ ███ █████ ██ ████ ███████ █████████ ████████ ████ ██████ ██ ██████████
Levels of pesticides ██ ███ ███████████ █████ ████████ ██ ██ ████ ███ ███████ █████ █████ ███ █████
Lake Laberge's water ████████ ████ ██████ ██ █████ ██████████ ███████ ██████████
Toxic chemicals usually ██ ███ ██████ █████ █████████ ██ ███ ███████████
North American manufacturers ███████ ███████ ██████████
Toxic chemicals become ████ ███████ ██████████ ████ ████ █████ █████████ ███ ████ ██ █████