Exceptionally high population densities occur in the Yangtze delta, the Pearl River Delta, and on the Chengdu Plain of the western Sichuan Basin. Most of the high-density areas are coterminous with the alluvial plains on which intensive agriculture is centred.
Explanation:
A.It led to humans eating more varied diets.
A strict policy of neutrality, the United States would not entangle itself with alliances with other nations.
the correct option is A&B
<span>Denmark
was preparing to join forces with Norway against common enemies. Denmark was on military alert to ward off a Norwegian attack. This is what characterized the two nations from where the Vikings came from.
</span>
Free rider problem
Economist
Mancur Olson identify that passivity on the part of individuals who
benefit from the work of activists but who do not join it or support it
in any way. He called the problems the free rider problem.<span>In order to overcome the free rider problem, he suggested that interest groups and civil rights groups should give material benefits to the members only.</span>
