Relative clauses are types of dependent clauses complete independent sentences - they usually refer to a single word and modify them. Here, in this excerpt, the relative clause would be that we can see in nature. Relative clauses usually begin with pronouns such as who, what, that, etc.
        
             
        
        
        
Answer:
yes, it uses supporting evidence
Explanation:
educated guess
 
        
             
        
        
        
Answer:
At participation and performance in rigorous high school courses among California high school students, both overall and across demographic and racial/ethnic groups. While enrollment in rigorous courses has been increasing, particularly among students who are traditionally underrepresented in higher education. Here's my answer that I would put! =)