Final answer:
Bicameral systems have stuck around in democratic regimes into modern times because they give voice to different segments of society and make legislating faster and more efficient.
Step-by-step explanation:
In democratic regimes, bicameral systems have stuck around into modern times for several reasons. Firstly, bicameral legislatures help give voice to different segments of society, allowing for diverse perspectives and interests to be represented in the lawmaking process. This ensures that the public's preferences are better served when both chambers weigh in on legislation. Secondly, bicameral systems help make legislating faster and more efficient. The need to pass legislation through another chamber creates a natural "veto point", where broad concerns and differing views can be considered, leading to more thoughtful and durable legislation.