Final answer:
Fish habitats vary between freshwater and saltwater environments due to complex life cycles, and human actions pose significant threats to fish populations.
Explanation:
Fish can be found in various aquatic environments, including freshwater lakes, ponds, rivers, streams, and the ocean.
Some species of fish have complex life cycles, moving between freshwater and saltwater habitats at different stages of their development. For example, salmon are born in rivers, then migrate to the ocean as adults.
Human activities like water pollution and dam construction can threaten the habitats of fish, leading to negative consequences for biodiversity.
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