Answer:
5. they live in social groups such as wolf packs
Explanation:
Animals such as wolves, humans, other primates, bird species, whales, etc. live in social groups because they evolved cooperative behavior. ... Animals who have genetic predispositions for communicative or cooperative behavior will have greater success and pass on more offspring who share that genetic predisposition
China has little environmental restrictions on industries making them extremely profitable at the expense of the environment, that's one of the reasons why China is one of the fastest-growing economies
There are 4 main large islands
Endemic diseases result in a decreasing population, so with that said you can rule out choices B and D.
Among the two left, letter A is the most appropriate answer. Not all endemic diseases have an effect on the number of children a population will have. So if we are speaking about endemic diseases in general, the answer is:
A. Endemic diseases can result in decreasing population numbers: many people die form diseases, and others move away from or avoid moving to places where diseases are rampant.