How does genetic variation among organisms affect survival and reproduction?

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u. s. and mexico. the st. lawrence seaway provides an important trading route for the u. s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

What element does susan b. anthony include in this passage to strengthen her argument?