Both were powerful nations and they served as trading hubs in their respective regions during that time.
A and D would make the most ground disruption but i think it is B in situ leaching
Scientific knowledge is based on observation and inference because observation helps the scientist to see while inference is made from observations.
<h3>What is scientific knowledge?</h3>
Scientific knowledge refers to the whole body of knowledge in science and the processes or method in which this knowledge is obtained.
Scientific knowledge is obtained by the scientific method of which observation and inference form a part.
Observation refers to the ability of a scientist to be keenly aware and observant of his surroundings and changes that occur in his experiments.
Inference refers to a conclusion a scientist reaches based on the results of his experiments and his observations.
Therefore, it can be concluded that scientific knowledge is based on observation and inference.
Learn more about scientific knowledge at: brainly.com/question/17216882
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