Aresearcher wants to conduct a secondary analysis using a centers for disease control and prevention (cdc) database that was collected by the agency solely for surveillance purposes from 1996-2006. the researcher did not participate in the initial collection of the data. the database is publicly available. the database does not include any identifiers. the irb makes a determination that the individuals whose records will be reviewed do not meet the federal definition of human subjects.
which of the following considerations was relevant to the irb's determination that this activity does not constitute research with human subjects?

answer; i believe that they became wealthy from gold and salt in their area, and became powerful by controlling trade in west

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)

answer; implicit memories explicit;