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When transmitting on a single frequency, all transmitters must work in which of the following modes?
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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