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A contaminated water supply system contains a dangerous substance that is a health hazard.
Amphibians
Cold-blooded vertebrates that include frogs, toads, salamanders, and newts, known for their ability to live both in water and on land during different life stages.
Atmospheric CO₂
The concentration of carbon dioxide in Earth's atmosphere, a crucial factor influencing climate change and global temperatures through the greenhouse effect.
Keystone Species
A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
Keystone Species
An organism that other species in an ecosystem significantly rely on, and if it were eliminated, the ecosystem would undergo major changes.
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