When he went to Milan, the Duke Sforza appointed him to be a military engineer where he had to design weapons and technological advancements that would help the duke gain warfare supremacy against enemies. He also built buildings and defenses, not just offensive weapons.
        
             
        
        
        
Answer: D. grooves
Explanation:
When a material is said to be fluted, it means that there is a narrow depression or cut on a material. The narrow depression is called a Groove. 
 
        
                    
             
        
        
        
Tinker vs. Des Moines- This Supreme Court case dealt with first amendment freedom of speech of students. In this case, Tinker and her friends wore black armbands with the peace symbol. This was a means to protest the US involvement in the Vietnam War. 
Hazelwood vs. Kuhlmeier- Even though this Supreme Court case dealt with the first amendment as well, the topic was different. The students in this case had there newspaper edited by the principal as it talked about subjects such as divorce and teen pregnancy.
        
             
        
        
        
<span>Nearly all American Indians
died because of a disease during the first Spanish colonies.  The most devastated disease recorded was
smallpox.  Smallpox was not common for
the native people since it originated from the European explorer, thus killing
mostly of the American Indian natives.</span>