Hi there!
I believe the answer is a spinal cord - all of these animals are vertebrates. 
Hope this helps!
        
                    
             
        
        
        
I the air breathable for all organisms?
is ther anyway o grow plants?
what source of water is there?
is it capable of having any type of housing?
is there anyway for electricity?
what is the temperature like?
can we produce clothing?
what kind of ecosystem is there if any?
        
             
        
        
        
The answer to the blank space is Catalog sellers.
B2B refers to a situation where one business makes a commercial transaction with another. For many, selling on B2B market places is a great way to expand businesses and sell more products to more customer. The most important thing in B2B is to understand how service companies differ from their product-selling counterparts. B2B companies that sell products tend to be very sales focused, they wait to sell as many products as they can. 
        
             
        
        
        
Answer:  The floor of an aquatic biome is called the benthic zone. 
Explanation:
 
        
                    
             
        
        
        
The sugar in DNA is deoxyribose. ... Nucleotides in DNA contain four different nitrogenous bases: Thymine, Cytosine, Adenine, or Guanine. There are two groups of bases: Pyrimidines: Cytosine and Thymine each have a single six-member ring.