11. The pores are perforations in the endoskeleton through which podia for gas exchange project from the body. 12. They'll p-most likely see you as a metal endoskeleton without its costume on. 13. The endoskeleton itself is smaller than the 800 / 850, allowing for a wider variety of disguises. 14. Keyhole sand dollars are so named because of the distinctive keyhole-shaped perforation toward the rear of the endoskeleton . 15. Conatron's endoskeleton appears to have previously been that of Obotatron, since it already had his right foot. 16. :Endoskeletons are remodeled by osteoclasts and osteoblasts continuously breaking down and reforming bone, on both ( all ) surfaces. 17. While launching their escape vehicle, an aerodyne, they are attacked by the cyborg Farnsworth, reduced to his mechanical endoskeleton . 18. This version does not contain the fight between Alex and Farnsworth's endoskeleton on the aerodyne, explaining his appearance here. 19. The Terminator is an efficient killing machine with a powerful metal endoskeleton and an external layer of living tissue that makes him appear human. 20. The mesohyl functions as an endoskeleton in most sponges, and is the only skeleton in soft sponges that encrust hard surfaces such as rocks.