Achange in a organisms environment that causes the organisms to react is called a?

What are the biggest challenges facing the average american citizen today? explain.

Why might collective bargaining fail, causing a union to go on strike? a the union agrees with the boss about wages. b the boss compromises about work hours. c the factory goes out of business, causing the workers to lose their jobs. d the boss refuses to address dangerous working conditions in the factories.

The information box says that the han added 4,000 miles of wall. refer to the mileage scale. how can this be true?