Which statement best describes a primary source? A. The source is written by the person who conducted the
experiment.
B. The source is written by an expert in the field.
C. The source is compiled from other sources.
D. The source is filled with mathematical equations.

I go with D but what you can do is u can read each and choose the one that sounds right Hope this helps

specific latent heat of fusion, lf, of a substance is defined as the amount of heat required to change a unit mass of the substance from solid to liquid state, without any change in the temperature.

explanation:

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it