Which statement about electric and magnetic fields is ture? A) Electric fields must leave a positive charge and end on a negative charge. B) Electric fields and magnetic fields start at a positive and end at a negative. C) Magnetic fields must start at the North pole of a magnet and end at the south pole of a magnet. D) Electric fields and magnetic fields loop from north to south.

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Explanation:

answer; /// i believe the correct answer is (thrombocytopenia); (a)

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]