answer:The Clean Water Act regulates the discharge of pollutants into U.S. waters and establishes surface water quality standards, which helps to protect freshwater ecosystems by preventing contamination and pollution. It also requires permits for those who discharge pollutants into U.S. waters, and sets limits on the amount and type of pollutants allowed. Enforcement of the act is carried out through a partnership between federal and state agencies.

answer:Advantages: - Cantilever systems are ideal for situations where space is limited as they do not require any additional support. - They provide a sturdy support mechanism for bridges and buildings, with their ability to handle compression and tension forces. - Cantilever structures can be used in combination with other types of structures to create complex structures that can withstand varied loads. - They can provide a distinctive architectural feature to a building or structure. Disadvantages: - Cantilever structures can be more costly to build than simpler structures like free-standing ones. - Structural testing is usually more complicated due to the fact that cantilevers rely on a continuous span of materials. - Cantilever structures can also be susceptible to deflection, especially if the depth of the span is too thin or the material used is not adequate.

answer:Israeli businesspeople play an important role in the global economy as innovative entrepreneurs and investors in various industries such as technology, agriculture, and defense. They have developed and brought to market numerous groundbreaking technologies and innovations that have revolutionized industries and improved people's lives around the world. Additionally, Israeli companies have substantial international reach and investment, which helps drive economic growth in many regions.

answer:The cultural and social changes of the 1960s, such as the youth rebellion against societal norms and the rise of counterculture movements, led to the emergence of rock music subcultures that embodied and expressed these values, particularly through music and fashion.