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Answer:
Electromagnetic field, a property of space caused by the motion of an electric charge. A stationary charge will produce only an electric field in the surrounding space. If the charge is moving, a magnetic field is also produced. An electric field can be produced also by a changing magnetic field.
SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit system.
1). both
2). Venus
3). Venus catastrophically; Earth too but much less.
4). Earth
5). Earth
6). Venus (It would be pretty hard for US to mistake Earth for a star.)
