Concept:A bicameral legislature has two chambers to allow detailed review of proposed laws before they are passed.
Explanation:In a bicameral system, a bill must be examined and debated by both chambers.
This double review helps to detect errors, remove defects, and improve the quality of laws.
It prevents hasty or careless legislation.
Each chamber acts as a check on the other through careful discussion and revision.
Therefore, the main purpose is to ensure thorough scrutiny of legislation.
Answer:D. thorough scrutiny of legislation.