Identify the fossil, describe its key features, state its pygidium size relative to its cephalon, explain the functions of parts X and Y, and specify its geological period.

Hey Mr., good to see you again. a) Identification: The fossil is a Trilobite. b) Describe the fossil: Trilobites are extinct marine arthropods characterized by a segmented body divided into three longitudinal lobes (an axial lobe and two pleural lobes) and three transverse sections: a head region (cephalon), a segmented middle region (thorax), and a tail section (pygidium). They possessed a hard exoskeleton and compound eyes. c) State the size of the pygidium in relation to the cephalon: The pygidium is approximately the same size as or slightly smaller than the cephalon. d) What are the functions of the parts labelled X and Y? Function of X: Protection of internal organs and articulation for movement. Function of Y: Vision. e) State the Period during which the fossil lived: The fossil lived during the Paleozoic Era (from the Cambrian to the Permian period). Send me the next one 📸