Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[Q]: Question: Electrons in the "outer shell" are also known as what kind of electrons? Answer: valence
[A]: Determine the total number of valence (outer shell) electrons. For cations, subtract one electron for each.

[Q]: Question: Because their cells are arranged in bundles, the appearance of skeletal and cardiac muscles is described as what? Answer: striated
[A]: http://zonalandeducation. com/mstm/physics/mechanics/vectors/introduction/introductionVectors. html.

[Q]: Question: What is a continuous flow of electric charge called? Answer: electric current
[A]:
Electric current is a continuous flow of electric charge. It is measured in amperes (A). Direct current (DC) flows in just one direction. Alternating current (AC) keeps reversing direction.