According to Peterson (2001), which of the following statements is true when using students as research participants? They, as a group, have formed stable political attitudes. They have a well-established sense of self-identity. They are less in need of approval than nonvolunteers. They, as a group, are more homogeneous than nonstudent samples.

As a group they are more homogeneous than nonstudent samples.

Explanation:

A research participant is defined as a person who volunteers in any human subject study or research program after they gave an informed consent to be the subject of the study or the research.

They are also sometime called as the human subject or a human trial.

Now according to Peterson, when students volunteer to participate in  any research study as a human subject, they as a group behave more homogeneous than the other non students samples or non student human subjects.

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)