Final answer:
Secondary evidence and research are important because they provide a broader range of information, allow for the expansion of knowledge, and save time and resources.
Step-by-step explanation:
Secondary evidence and research are important for several reasons. First, it provides a broader and more diverse range of information and perspectives on a topic. By gathering evidence from multiple sources, we can ensure that we are not relying solely on one person's opinion or biased viewpoint.
Second, secondary evidence allows researchers to build upon existing knowledge and expand our understanding of a subject. By reviewing and analyzing previous research, we can identify gaps in knowledge and design studies that address those gaps.