Directions: Four parts of the sentence given below have been underlined and numbered 1 to 4. Identify the part having an error. If no part has an error, mark (5).

Dinosaurs (1) are traditionally classified as cold-blooded reptiles, (2) but recent evidence based on their eating habits, posture, and skeletal structure (3) suggested some (4) may have been warm-blooded. (5) No error