The brain operates on two levels, conscious and unconscious. this is called:

Answer : The correct answer is -

A two track mind.

The brain operates on two levels, which are the level of consciousness (awareness) and unconsciousness (that is not related to awareness).

In other words, our perception, thinking, memory all operates at two levels (also called dual processing) that are conscious (which is a highly controlled, explicit level) and unconscious (implicit, non controlled, automatic level).

This is termed as two track mind.

sorry, but you do not have posted the diagram.

"a.) well–developed vascular system."