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Frogs are considered indicator species in wetland ecosystems due to their sensitivity to environmental changes. Their permeable skin makes them highly susceptible to pollutants and habitat alterations.
Their presence or absence can signal the health of an ecosystem. Frogs also play critical roles in the food chain, both as predators of insects and as prey for larger animals.
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Niagara Falls was formed more than 12,000 years ago during the last Ice Age, and its powerful flow can fill an Olympic-sized swimming pool every second.
