671A species that no longer exists anywhere on Earth is generally described as what?
672Organized efforts to protect natural habitats, species, and ecosystems are generally referred to as what?
673Large-scale removal of forests, generally known as deforestation, commonly leads to loss of habitat and increased what?
674Certain industrial chemicals, known as CFCs, were historically identified as a major cause of damage to which protective atmospheric layer?
675Global warming is primarily attributed to a long-term increase in the concentration of what type of atmospheric gases?
676Among Earth’s major terrestrial ecosystems, which one is generally recognized for having the greatest overall biodiversity?
677Coral reefs, home to rich marine biodiversity, are generally found in what kind of ocean environment?
678Many bird species undertake long seasonal journeys between regions, a behavior generally known as what?
679The dormant, inactive state that certain animals enter to conserve energy and survive cold winters is generally called what?
680The ability of certain animals to visually blend into their surroundings for protection is generally called what?
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