The clean water act ___ set maximum contaminant levels for drinking water
required industries to reduce or eliminate point source pollution in surface waters
established national ambient air quality standards
requires that pollution control devices be installed on cars and trucks and at factories

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.