The correct answer is (a.) coma. Vaporized gasses and released dust that forms a bright cloud called a coma, around the solid part of a comet. Coma is in a nebulous envelope form that surrounds the nuclei of a comet.
This is false mark brainless.
They are called portable classroom
Answer:
The rate at which the motor neurons action potential are acting using more and larger motor units embed over the neurons that'll ultimately trigger the contraction of more muscle fibers according to different kinds of load.
