Answer:
A AND D I THINK PLZ MARK BRAINLIEST 
 
        
             
        
        
        
Answer:
B. VESSELS, HEART, CIRCULATING FLUID.
Explanation:
Blood is the circulating fluid. It is the connective tissue of liquid plasma and cells.
Heart is a muscular pump to move the blood and have it circulate throughout the body of living animals.
Blood vessels are arteries, capillaries and veins that deliver blood to all tissues.
The Circulatory System has two types. They are the open circulatory system and the close circulatory system.
An open circulatory system is one where the blood does not circulate inside blood vessels  but also flows into cavities that irrigate tissues.
A close circulatory system is one where the blood circulate only inside the blood vessels.
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Answer:
a <u>Substitution point</u> mutation changes one base in the genetic code. Only one <u>nucleotide</u> may or may not be affected. An insertion or deletion causes a   <u>frameshift</u> mutation which affects all the amino acids following the mutation.
Explanation:
 
        
             
        
        
        
I want to say it is going to be Carbohydrates. Sometimes bing works if you look it up and click on the yahoo answers link. Just a hint to help you out some! :) Have a good day! :)