Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the right order to form a meaningful and coherent paragraph.
A. These kinds of sharks are known as obligate ram ventilators because they draw water in through their mouths and force it out through their gills.
B. They use a method called buccal pumping, in which water is pulled in through the mouth and forced out through the gills by the cheek muscles.
C. It is true that many types of sharks must keep moving in order to receive life-giving oxygen from the water passing through their gills.
D. Other types of sharks are able to remain stationary because they possess special structures called spiracles, which force water out through their gills.