Answer:
1.  to carry oxygen from the lungs to the body tissues 
2. seven (7) or (4)
3.Humans can't live without blood body's organs couldn't get the oxygen and nutrients they need to survive, 
Explanation:
 
        
             
        
        
        
I think it would be D hope this helps
        
             
        
        
        
Answer:
D. the genetic material of living organisms
Explanation:
 
        
             
        
        
        
Answer: The answer is (D) Hypothesizing 
Explanation: You're supposed to plan the outcome of your experiments before performing it
 
        
             
        
        
        
Any property that describes how a substance reacts with another substance when forming a new substance is the Property of Reactivity
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Explanation:
The ability of substance to readily react with other substance to produce new product is called as reactivity. 
It describes about different methods used by the reactants to form new product. 
Sometimes one single reactant gives rise to two different products as in splitting of water during which the following reaction takes place:
H_2 O →2H_2 + O
On contrary, two substance combines together to give rise to one single product as:
2 Mg + O_2  →2MgO