Sam and Jenny ride their bikes at a constant velocity of 3 miles per hour.
Explanation:
Here we see that both of them are moving at a constant velocity which means their speed is constant and they are moving in a straight line. 
Zero acceleration is implied on the bikes and the net force is BALANCED.
When forces are in balance, acceleration is zero. Velocity is constant and there is no net or unbalanced force.
 
        
             
        
        
        
Wiping off the surface of the lab table with a disinfectant
        
             
        
        
        
This is true, for it is called redshift
        
             
        
        
        
Nematodes<span> are the bacterial feeders, fungal-feeders, plant parasites, predators, and omnivores.</span>
        
             
        
        
        
The amount of water on the planet is fixed; it neither increases or decreases. Glaciers are sheets of moving ice. This water to form these extensive sheets must come from somewhere. The water comes from the most extensive store on the planet; the oceans. Ice Ages always corresponds to periods of low sea level because much of the ocean water is is land locked as glaciers.