Change cannot be notice

Gradual

Steady

Marginal

Slight

Modest

Between 1850 and 1900, there was a……. Increase in human population

 

Noticeable increase

Dramatic

Spectacular

Sharp

Significant

 

Between 1950 to 2000 , there was ……increase in human population

 

Climb/soar/ surge/ go up/ soar/ rocket/ leap

Between 1950 and 2000, the human population…..

 

Increase ( count noun)

Growth ( non count noun)