Choose two.
possible reasons for the interaction between pastoral and agrarian societies include
1.changes in climate
2.overpopulation
3.the development of trade routes
4.strong nomadic leadership wanting to expand their lands

1. changes in climate

2. strong nomadic leadership wanting to expand their lands

Explanation:

The pastoral society is a nomadic group of people who travel with a herd of domesticated animals, which they rely on for food while the agrarian society, or agricultural society, is any community whose economy is based on producing and maintaining crops and farmland.

Having defined what both societies represent, there's a need to state the possible reasons for interaction between these two societies.

The changes in climate, especially increased atmospheric CO2, temperature and precipitation had great impacts on the agarian and pastoral societies as there was a need to balance the atmospheric conditions in other for both plants and animals to survive.

Normadic leadership whereby a fixed habitation which regularly moves to and from the same area in other to settle down also led to the interaction between these two societies.

a

explanation:

the industrial development of cities in the ruhr area in the nineteenth century is described. the research was based on english and german language sources. several factors that shaped growth and paths of the cities were categorized and analyzed. they are locations, resources, traditions, entrepreneurs, and technological developments. locations and resources were the most important among them; other factors may be regarded as consequences from locations and resources. among the cities, bochum, essen, gelsenkirchen, and dortmund had the richest resources and most favorable locations in the transportation network and grew to be the largest cities in the ruhr area near the end of the nineteenth century. riverside location was also a favorable factor for the development, as shown in the development of duisburg on the confluence of rhine and ruhr. resource distribution can explain the rise of textile industry, metallurgical industry, and coal and iron industries, and the northward progression of the mining industry. tradition was an important factor for cities such as krefeld, barmen, elberfeld, solingen, and remscheid, which experienced development based on their traditions through the nineteenth century. various entrepreneurs exerted influences within and beyond the local level over the ruhr area. technological development stimulated the northward progression of the mining industry and the deep connection between the coal and the iron industries.