which of the following contributed most to the fish population dying during the 1970's
None of the above.
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To determine which of the following factors contributed most to the fish population dying during the 1970s, we would first need to list out the potential factors that could have played a role. Unfortunately, you did not mention what these factors are. However, I can provide you with some common factors that are known to have had negative impacts on fish populations during that time:
1. Pollution: Industrial waste, agricultural runoff, and untreated sewage were common sources of water pollution in the 1970s. These contaminants can have detrimental effects on fish health and survival.
2. Overfishing: Mismanaged fishing practices, such as excessive harvesting of fish without allowing sufficient time for populations to replenish, can lead to depleted fish stocks.
3. Habitat destruction: Destruction of critical fish habitats, such as wetlands, coral reefs, and spawning grounds, can disrupt the breeding and survival patterns of many fish species.
4. Climate change: While climate change might not have been as widely recognized in the 1970s as it is today, changes in water temperature, acidity, and oxygen levels can affect fish populations.
5. Disease and invasive species: Introduction of non-native species and the spread of diseases within fish populations can result in significant declines.
Given these factors, it is challenging to determine which one contributed the most to the fish population decline in the 1970s without more specific information. In reality, it is often a combination of multiple factors working together that lead to such declines.