The different blood vessels; First, Arteries that carry the blood from the heart. Then, the Capillaries which allow an exchange of water and chemicals throughout the blood and the tissues. Finally, Veins that carry blood from the capillaries to the heart.
 
        
        
        
 Answer:
double helix
Explanation:
Together, a base, sugar, and phosphate are called a nucleotide. Nucleotides are arranged in two long strands that form a spiral called a double helix
 
        
             
        
        
        
Invertebrate doesn't posses "Backbone" whereas Vertebrate chordate have that. That's the only & most important difference between them.
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These abnormalities occur in the serotonin system which reduces and/or inhibits control in their movement. This disruption of the neurotransmitter causes them to act maladaptively. Thank you for your question. Please don't hesitate to ask in Brainly your queries.