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Which sentence best represents the thesis of this article? a they challenge us to consider whether we can trust what we are seeing. b optical illusions may seem mysterious, but they are not unexplainable. c through science, we can learn how optical illusions work. d let’s take a look at three common optical illusions and explore the science behind each one.

Part d most of the group decides to use the wood to build a fence, which would divide the island from the beach. but some people don't want to use the wood for that purpose. do you think it would be fair to make those people build the fence?

Recently, there has been pressure to loosen clean air standards. use economic arguments to support or oppose this proposed action.