I think that it is c but at the same time i think it is b
Besides connecting the eastern united states with the western united states, the transcontinental railroad was also instrumental in bringing in immigrants from ireland and china.
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Women have longer life expectancy than men because it is biologically supported. <u>Firstly, women engage less in behaviors that are bad for health than men</u> such as excess smoking and drinking. In addition to that, <u>women currently better profit from advanced health care and better living conditions</u> such as regular medical check-ups.
Moreover, from the genetics perspective, when mutation occurs of one gene of the X chromosome, <u>women have another X chromosome for compensation which increases their resistance to biological aging</u>. Lastly, men participate in activities/works especially those that <u>utilize more muscles and energy that result into their worn out state faster than compared to women .</u>