Yes population is a dynamic phenomena as it is not stopping any time it continuosly changing as sometimes some people dies and some are born  . on an average in india in one minute 4 child are born and some value in the world 
some are dying so its not a stable phenomena its changing every second 

Yes, obviously population is dynamic phenomena. As the population is changing very continuously it can be termed as dynamic phenomena. To understand this we must know that India stands first with most birth rates and stands second with most death rates.It mean births and deaths are taking place continuously. So population is dynamic phenomena as it depends on birth and death rates. Hope this helps you