Answer:
A Base example is soap, dishwashing soap. It's slippery, to the touch right?
Explanation:
 
        
             
        
        
        
Gravity is<span> the force that pulls vehicles toward Earth. It depends on the mass of the object. The bigger the mass the bigger the gravity force. </span>
Gravity has a higher effect on heavy, large and high profile vehicles. The heavier the vehicle the bigger the force that pulls the vehicle toward Earth. 
        
             
        
        
        
Answer:
faced a struggle for survival
Explanation:
The woolly mammoths became extinct, unlike the other species, because the woolly mammoths faced a struggle for survival due to changing of environmental conditions. Global warming is the main cause of extinction of woolly mammoth which destroy their habitats about 10,500 years ago. The environmental conditions are not favourable for them so they faced struggle for survival which causes extinction of woolly mammoth.
 
        
             
        
        
        
Airborne is the most common.