Which of these passages is an example of a functional text?

passage 1
circulatory systems are vital to every organism. in some, this system is simple. for example, in earthworms, the "heart" is just five branching blood vessels near the worm's head. the worm's heart does not pump; instead, blood and fluid move through the worm as it moves through the soil. the octopus, a more complex animal, has three hearts because its main heart does not pump strongly. humans only have one heart that is divided into four chambers. these chambers separate oxygen-rich blood from blood rich in carbon dioxide. regardless of its size, the circulatory performs many important jobs.

passage 2
ptolemy commences with laying down the undoubted truth that the shape of the earth is globular. the proofs which he gives of this fundamental fact are quite satisfactory; they are indeed the same proofs as we give today. there is, first of all, the well-known circumstance of which our books on geography remind us, that when an object is viewed at a distance across the sea, the lower part of the object appears cut off by the interposing curved mass of water.
(from great astronomers by robert stawell ball)

passage 3
[miss havisham] was dressed in rich materials—satins, and lace, and silks—all of white. her shoes were white. and she had a long white veil dependent from her hair, and she had bridal flowers in her hair, but her hair was white. some bright jewels sparkled on her neck and on her hands, and some other jewels lay sparkling on the table. dresses, less splendid than the dress she wore, and half-packed trunks, were scattered about…
(from great expectations by charles dickens)

passage 4
first, learn and observe all posted safety instructions and adhere to all general safety guidelines. this includes knowing where fire extinguishers are located and maintaining an immaculate and orderly work station. to use a fire extinguisher correctly, follow the steps described in pass: 1: pull the pin; 2: aim at the base of the fire; 3: squeeze the top handle or lever; 4: sweep from side to side. following these instructions can extinguish a fire quickly and safely.