The most common and obvious fossils are the preserved skeletal remains of animals. Other fossils, which are also evidence of past organisms, include leaf impressions, tracks and trails, burrows, droppings, and root casts.
Lesson Summary. Non-experimental research does not mean nonscientific. Non-experimental research means there is a predictor variable or group of subjects that cannot be manipulated by the experimenter. Typically, this means that other routes must be used to draw conclusions, such as correlation, survey or case study.
Another limitation of marketing research is the paucity of the trained research personnel. 1  market research Measure the past not the future. 2  Report findings does not makes decisions. Market research provides information upon which decisions are made. 3  Address accurately certain topics and issues.