In merry-go-round, the speed is constant but velocity is not constant, because its direction goes on changing i.e., there is acceleration in the circular motion. So, we can say that the boy is in accelerated motion.
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Camillo Golgi, discovered the method of staining individual cell structures. He used weak solution of silver nitrate to study golgi apparatus.
Rusting of an object made of iron is called rusting. Rust is a chemical change because rust is a chemical compound (hydrated iron oxide), completely different from the element iron (Fe).
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The nature of matrices varies according to their function. For example, cartilage contains calcium salts as it supports bones while muscles contain contractile proteins for their movement function.