The answer is D because of other answers
Answer:
pull factor
Explanation:
The answer is "pull factor".
Pull factor is considered as a factor for migration to other countries or regions for better life prospects.
These are some of the factors which attract people or encourage people to leave their native country and migrate to another country in search of better living standards, good job opportunities, political and religious freedom, environmental safety, etc.
Pull and push factors are two great concerns of today's world which drain many people to other countries. They are generally considered as the north and south pole of the magnets.
Thus the answer is "pull factor".
They live is harsh environment that no other creature could withstand for example thermal vents.
