Indentify the charges that are negative

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above