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You have isolated a newly discovered virus and are attempting to characterize it. You begin with its genome. You first isolate the virion- producing mRNA from culture cells infected with the virus. When you compare these mRNA with the viral genome, you find that they are complementary. What does this tell you?
Geologic Timescale
A chronological dating system used by geologists and other scientists to describe the timing and relationships of events in Earth's history.
Geologic Timescale
A system of chronological dating that classifies geological strata in time, used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events in geologic history.
Unconformity
A surface within rock layers that represents a period of erosion or non-deposition, indicating a break in the geological record.
Index Species
Species that indicate the presence of particular environmental conditions, used by scientists to assess the health of ecosystems.
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