Explain why emerging efforts are focused on reducing health risks from exposure to chemicals rather than completely eliminating those risks.
Working with all chemicals carries some level of health risk, and modern society is dependent upon thousands of chemicals to maintain our standard of living. Therefore it is not reasonable to eliminate all chemical related health risks because that would require we stop using chemicals like cleaning supplies, gasoline, and fertilizers. The more practical approach is to minimize and manage the health risks associated with chemical exposure.
As a vector for the introduction of nonnative species, why is hull fouling particularly difficult to combat?
Recreational boating and commercial shipping are an immense source of revenue and commerce around the world. Therefore, the need to protect the environment must be balanced against the needs of individuals and communities to earn a living. People who financially benefit from these industries do not want too many obstacles erected in the way of such businesses.
Explain how increased energy efficiency is beneficial.
Increased energy efficiency allows for the same level of service to be achieved with reduced energy use. Energy use is associated with greenhouse gas emissions, so by decreasing energy use greenhouse gas emissions will be decreased as well. Nonrenewable resources that are used for energy production, such as coal and oil are used at a slower rate with greater energy efficiency as well. Increased energy efficiency results in lower costs for energy consumers.
Put the following organisms in an aquatic food chain in the order in which energy flows through them, explaining the reason for their placement.small fish, mammal, phytoplankton, zooplankton
phytoplankton → zooplankton → small fish → mammal. Energy flows from producers (phytoplankton) to primary consumers (zooplankton) to secondary consumers (small fish) to tertiary consumers (mammal).
Explain how conservation efforts have positively impacted ecosystems.
Conservation efforts have had a positive impact on ecosystems that have been previously harmed due to human activity. Conservation efforts have helped preserve and even restore habitats that had been damaged or threatened by human activity. They have also helped protect endangered species.
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