since the 1970s the united states and canada have reduced ________around lake Erie.
a. unregulated boat traffic
b. overgrowth of destructive algae
c. noise pollution
d. illegal immigration
Incorrect.
http://en.wikipedia.org/wiki/Lake_Erie
Right. It's b.
To find the answer to this question, you can start by researching the efforts made by the United States and Canada to protect and conserve Lake Erie since the 1970s. Look for information on the joint initiatives, agreements, or specific actions taken by the two countries regarding the lake.
One reliable source of information is government websites, such as the official websites of the U.S. Environmental Protection Agency (EPA) and Environment and Climate Change Canada. These sites usually provide detailed information about environmental issues and conservation efforts in the region.
You can also check academic and scientific studies, research papers, or publications related to Lake Erie's environmental changes and conservation efforts.
Once you have found credible sources, focus on the various factors that have been addressed around Lake Erie since the 1970s. Look for information related to options a, b, c, and d.
In this case, the correct answer is b. Overgrowth of destructive algae. Over the years, both the United States and Canada have implemented measures to reduce the amount of harmful algal blooms in Lake Erie, which have been detrimental to the lake's ecosystem and water quality.
By following this research process, you should be able to find the answer supported by reliable information.