Question

what is birth rate and death rate and migration

Answer 1

Birth and Death Rates, Natural Increase. Birth Rate is the term used to define the number of babies born every year per 1000 people in a population. death rate is the term used to define the number of deaths every year per 1000 people in a population.
Seasonal movement of animals from one region to another is called migration

Answer 2

birth rate is the number of live births per 1,000 persons in a year.
death rate is the number of deaths per 1000 persons in a year.
migration is the movement of people from one place to another for better job facilities, living conditions etc.