The statement that best reflects a key difference between the Roman Senate and the US legislative branch is:
Although Roman Senators served for life, the writers of the US Constitution specified term lengths to limit individual power.
This highlights a fundamental difference in how the two bodies were structured regarding the term lengths and the concept of limiting individual power within the legislative framework. In contrast, the Roman Senate was composed of members who served for life, which often concentrated power in the hands of a few individuals. The US Constitution established term limits for both the House of Representatives and the Senate to promote accountability and prevent the entrenchment of power.