Answer:
Cell membrane
Explanation:
The cell membrane is a flexible and permeable skin surrounding a cell.
 
        
             
        
        
        
It is speeding up because more distance is covered every second.
Explanation:
The car can be described to be speeding up because more distance is covered every second. 
From what we understand about velocity and acceleration, the car is accelerating through the ramp. 
It's velocity is increasing with every second it covers. 
This will invariable reduce the time between each distance covered. 
Originally, the toy car starts with a low initial velocity or speed. As it gains acceleration, the speed will increase and more distance covered per seconds. 
This is why the dots clustered towards the end of the diagram. The positions are getting closer and distance reducing per seconds. 
Learn more: 
Speed brainly.com/question/1548911
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Mushrooms because they belong in the fungi kingdom
        
                    
             
        
        
        
Water molecules are polar. This means that one end of the molecule is positively charged, while the other is negatively charged. Opposite charges attract. Water molecules on the faucet that are eventually pulled away from the others by gravity will themselves pull together and form round drops because the charged portions of molecule attract the oppositely charged portions of another.