Yes they libed before the dinasours and during the jurassic (triassic period).
        
                    
             
        
        
        
The number of protons in an uncharged atom equals the number of electrons.
 
        
             
        
        
        
Answer:

Explanation:
Hello.
In this case, we can solve this problem by applying the Boyle's law which allows us to understand the pressure-volume behavior as a directly proportional relationship:

In such away, knowing the both the initial pressure and volume and the final volume, we can compute the final pressure as shown below:

Consider that the given initial pressure is also equal to Pa:

Which stands for a pressure increase when volume decreases.
Regards.
 
        
             
        
        
        
The nucleus is made of protons and neutrons. It has a positive charge.