Answer:
Agriculture allowed people to stay in one place, and increased food production caused the population density to expand far beyond levels that could be sustained by hunting and gathering alone. This growth in population density provided a critical mass of people to sustain and spread contagious infectious diseases.
Relatively smooth waters helped trade and cultural exchange across the Mediterranean Sea. temperate climate provided for diverse and <span>abundant agriculture, substantial trade.</span>
The degree of vertex D is if it is an indegree or outdegree, it is 1 degree in vertex D.
Outsourcing, which just a decade ago played a very small role in the biotechnology and pharmaceutical industry, steadily is becoming an integral part of the operation of such companies. And, among the numerous outsourcing destinations, contract research organizations in emerging global markets like China, India and Brazil rapidly are becoming the primary targets.
