Climate, time, parent material and topography are the factors which are responsible for the formation and development of soil.
Explanation:
Climate is the average weather conditions of an area which includes rainfall and temperature. Time for the development of soil is also important for the changes occurs. Parent material means from which particles, soil is formed. Topography refers to the physical features of land such as mountain and hills etc.
The answer is : randomization was not used in sample selection. The major difference between experimental and quasi-experimental designs is lack of randomization in sampling selection.
