Purines have 2 rings pyrimidines have 1 ring.
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Answer:
1. emigration the movement of people from one place to another
2. immigration a situation in which resources are being used up at a faster rate than they can be replenished
3. migration the leaving of one's homeland to settle in a new place
4. overpopulation the movement of people to a new country
5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population
Explanation:
Those are the five invertebrate groups in the animal family tree
