I think the answer is "viruses can only multiply within a living cell." the other ones don't really sound right. but i'm not absolutely sure. 
 
        
                    
             
        
        
        
Answer:
1 - 
a. Arrow pointing inward (water goes into the cell)
b. Hypotonic solution
2 - 
a. Arrow pointing outward (water goes out of the cell)
b. Hypertonic solution
3 - 
a. Equal sign (no arrow)
b. Isotonic solution
4 - 
a. Arrow pointing outward (water goes out of the cell)
b. 10% h20 70% solute
c. Hypertonic solution
5 - 
a. Arrow pointing inward (water goes into the cell)
b. 50% h20 (in the cell) 20% h2o (out of the cell)
c. Hypotonic solution
6 - 
a. Arrow pointing outward (water goes out of the cell)
b. 30% solute (in the cell) 80% solute (out of the cell)
c. Hypertonic solution
 
        
             
        
        
        
1. You would go faster.
2. You would eventually hit terminal velocity.
3. No longer accelerating.
#2 Depends on the weight and surface area (wind resistance)of the object
Acceleration - a change in velocity