A sub-variant of the A-8 was the R2, which had two of the 20mm cannons replaced by more powerful 30mm guns and added armor protection for its role in attacking the giant 4-engined Allied bombers. About the Messerschmitt Me262 A-1a. The revolutionary Messerschmitt Me262 was the first jet powered plane to see service. Then, in November 1944, the Me262 A-1a fighter version was finally put into production.
It is gradually converted into bone over time. Discuss the development of the vertebrae, ribs, and sternum. The vertebrae, ribs, and sternum all develop via the process of endochondral ossification.