Answer:
Youngest to Oldest 
Shale with ammonite 
Limestone with unknown fossil
Basalt
Sandstone with trilobite
 
        
             
        
        
        
<h2>Sea star  </h2>
Explanation:
In the given example sea star played the role of keystone species 
- Robert Paine actually coined the term keystone species to describe the effect that the sea stars had on biodiversity in this community
- Keystone species are those species which are least abundant but play a governing role to decide the structure and function of community 
- Loss of keystone species in a community can lead to disturbance in structure and function of a community and it cannot be recovered by other species  
 
        
        
        
Answer:
No. If a women cant have a child, its just called female infertility refers to infertility in women. But they are still alive
 
        
                    
             
        
        
        
Answer:
Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent.
Explanation:
 
        
                    
             
        
        
        
Hi!
I think it would be behavioral, because it is one flower who isn't ready to reproduce.
Hope this helps!