Ascientific theory a. describes what occurs every time in a given situation b. is not validated by experimentation c. can never be changed d. is an explanation for a set of events select the best answer from the choices provided a b c d

A scientific theory is an explanation for a set of events SO option D is correct.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl