B. Africa and South Asia reactions
Answer:
The Case Study
Explanation:
The Case Study is an in-depth investigation of a person’s life, social groups and how he/she interacts with its community. The type of information mentioned in the study is mainly biographical, explaining what is currently occurring and happening on the person’s everyday life. Psychologists use this method to collect data and make a general analysis or hypothesis.
The advantage of an assembly line is that he has to think less aout what needs to be done as it automates the whole process, a disadvantage of the assembly line is that the required output is much higher than it was required of workers in previous periods.
Answer: It's an EXPERIMENT
Explanation: Experiment is done when we apply anything to a samples or conditions in other to study another sample or conditions.
Observation is done when, we study samples or conditions in it's natural way, without application of anything that may alter it's result.
Because the researcher has applied fertilizer to one side and did not apply to the other side, that means he has performed an experiment. Since he wasn't observing the two sample in it's natural way without any external application.