Which revision of the sentence is now properly punctuated? the peripheral nervous system—which is a network of nerves extending from your brain and spinal cord to all parts of your body carries signals back and forth. the peripheral nervous system (which is a network of nerves) extending from your brain and spinal cord to all parts of your body carries signals back and forth. the peripheral nervous system which is a network of nerves extending from your brain and spinal cord to all parts of your body carries signals back and forth. the peripheral nervous system—which is a network of nerves extending from your brain and spinal cord to all parts of your body—carries signals back and forth.

The revision of the sentence that is properly punctuated is the last one, the one with the em-dash.

Explanation:

The em dash is one of the most versatile punctuation marks as it can take the place of commas, parentheses, or colons. In this case, the em dash has been used instead of the parentheses. Yet it is important to bare in mind that em dashes are less formal than parentheses and they are also more intrusive. You can use them to draw attention to the parenthetical content. In this case, the use of the em dash highlights the definition of the periphereal nervous system.

its probably fingerprint or personality

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.