In cross-fostering studies, the young of one species are placed in the care of adults from another species. in broad terms, what do researchers learn from such studies?

These sorts of studies can help researchers determine the relative importance of nurture and nature in determining a trait. Nature here would refer to genetics passed down to an individual from its parents, whereas nurture refers to the environment the individual is exposed to.

Rna polymeras should attache to the promoter.