Anew study revealed that sleeping at least hours a night was linked to longer telomere length.

A telomere is the region at the end of each chromosome. It is this region that protects chromosomes from deteriorating or fusing from other chromosomes and it is found out that people who sleep at least 7 hours a night are linked with the longer lengths of telomere.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

answer; ratification;