Answer:
the complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord.
Explanation:
^
Answer:
approximately 4.5 billion years ago
Explanation:
B: between a nonmetal and a metal.
Answer:
Gray (or Grey) Matter-the darker tissue of the brain and spinal cord, consisting mainly of nerve cell bodies and branching dendrites.
White Matter-he paler tissue of the brain and spinal cord, consisting mainly of nerve fibers with their myelin sheaths.
Explanation:
