For each statement in questions 20 through 22 select the chemical reaction, chosen from the list below, that is most closely associated with that statement. 7GYlmD-QRCVyP5KeVwgbBYMPZfCmbge7mRp EL3QfRG9BXk6BTNbjCdbDHoq_FHl49rycdJ RZW1OJRLexby0XabK0UQdkO7xHbyjfA963d qcnMRhrIrkIbsgEQPAdYdJZ7E8QLX6i This reaction is used in the brewing industry

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?