I'm sorry its A..I didn't read it correctly...
Always melt chocolate slowly, at a low temperature. The melting point of chocolate is between 86 degrees F. (30 degrees C.) and 90 degrees F.
Answer:
"The separation of twins conjoined at the head was a medical miricle , but the The story of the surgery that made Ben Carson famous — and itsIf things go badly it would be terrible for the young doctor's career,”
EnJoY ThE AnSwEr!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
This is extremely vague, but assuming this is regarding concentration gradient in the nervous system, the Sodium-Potassium pump is responsible for transporting sodium and potassium.
D. is the correct answer. It uses neurons to signal.