The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.
Such are the strata which we
X: species as those now living in the Mediterranean
Y: meet with in the south of Sicily, filled
Z: with shells for the most part of the same
YXZ
XZY
XYZ
YZX
D.
YZX