Explanation:
BB=Brown as both are big B's
Bb=Brown as there is a big B
bb=Blue as both are little b's
 
        
             
        
        
        
Answer: Shale changes into Slate. 
Explanation:
Shale is a sedimentary rock, formed by the deposition and compression of clay and silt. 
Shale layers is buried deep into the earth through the process of deposition (i.e the laying down of rock forming material by natural entities like glaciers, wind, and water).
Temperatures and pressures rise greatly because the shale’s layers are buried. When the temperatures and pressures become higher. The shale is changed into a metamorphic rock (with dark brown streak), called Slate.
 
        
             
        
        
        
Answer:

✏ Arteries are the vessels that carry blood away from the heart to various organs of the body.Since, the blood emerges from the heart under high pressure, the arteries have thick, elastic walls.
 
        
             
        
        
        
Answer:
there is no picture so I can't tell :)