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1_______. A theory is considered to become a part of scientific knowledge if it has been tested experimentally and proved to be true.
2_______. As scientific knowledge has grown and become more complicated,
many new fields of science have appeared. 3_______. Numerous areas of science overlap each other and it is often hard to tell where one science ends and another begins. 4_______.
Scientific theories consist of general principles or laws that attempt to explain how and why something happens or has happened.
Scientific study can be divided into three major groups: the natural, social, and technical sciences.
At the same time, the boundaries between scientific fields have become less and less clear.
All sciences are closely interconnected.
