Parts of CEROnline version Match the parts of CER structure to their name, description, and an example. Each group should have 4 pieces to be complete. by Lindsey Stabile 1 C 2 E 3 Group 3 A strong statement that answers an open-ended question and can be supported by evidence. Claim Rome's seas and rivers provided important trade access. C A piece of text or description of an image that supports a statement. "Along the Tiber River, many Roman merchants made a living by selling their products." Evidence E R Reasoning An explanation that proves a statement using evidence provided. This text shows that the Tiber River was crucial for merchants to sell and trade their goods.