Aircraft bodies are made up of .
Hence, Aircraft bodies are made up of aluminium.
Question 43 Fill in the blanks (a) Lining of blood vessels is made up of ___. (b) Lining of small intestine is made up of ___. (c) Lining of kidney tubules is made up of ___. (d) Epithelial cells with cilia are found in ___ of our body.