Answer: A mutualistic and A a decrease in the number of corals, so buy coral to help the local economy 
Explanation:
 
        
             
        
        
        
Like what our backyards look like
if so then my backyard has tons of flowers and a big white shed
        
             
        
        
        
I am more of a chemistry person, but my best answer is the double-helix structure.  The DNA rotate around a central point allowing it to keep a constant distance
        
             
        
        
        
Answer:
 mitochondrion / mitochondria coming from the apex.
 
        
             
        
        
        
Answer:
Arteries have thick walls composed of three distinct layers (tunica) Veins have thin walls but typically have wider lumen (lumen size may vary depending on specific artery or vein) Capillaries are very small and will not be easily detected under the same magnification as arteries and veins.
Explanation: