Biology
Grade-9
Easy
Question
If the group of birds move out of an area permanently, is called ______________
- Natality
- Mortality
- Emigration
- Immigration
Hint:
If the group of birds move out of an area permanently, is called emigration.
The correct answer is: Emigration
- Emigration means leaving the birth country or country to residence to a new country ( abroad ).
- Emigration can be due to many reasons like economic stability, war, better opportunities etc.
- Emigration is an important factor in population density.
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