Examlex
A recent source of toxic waste is the disposal of computer components.
Fossil Record
The accumulation of evidence in rock layers about the history of life on Earth, including the remains or imprints of organisms from past geologic ages.
Homo Sapiens
Modern human species.
Quaternary
The most recent geological period, starting 2.58 million years ago and continuing to the present, characterized by ice ages and significant human evolution and development.
Extinction
The elimination of a species; occurs when the last individual member of a species dies; see background extinction and mass extinction.
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