Aresearcher observes the social interactions between people who go to a large sports bar. at the end of the evening she takes a blood sample from everyone and sequences their dna. she finds that people who have a form of the dopamine receptor that predisposes them to risk-taking behavior are more likely to approach and begin talking to potential sexual partners than people who had a form of the dopamine receptor that was not associated with risk-taking behavior. can the researcher conclude that having this "risk-taking gene" makes it more likely that people will approach and interact with potential sexual partners?

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.