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Scientists have debated the definition of life for decades, but they still lack a consensus on the answer. Experts believe that "edge cases" make life difficult to define and blur boundaries across ...

To biologists, a "species" is the fundamental unit of categorization for life on Earth and a key tool for protecting living creatures. When you purchase through links on our site, we may earn an ...

People often feel that they can intuitively recognize whether something is alive, but nature is filled with entities that flout easy categorization as life or non-life — and the challenge may ...