find
(I) -6/5 *(-2)
(ii) - 3/5 * 7
(iii) - 3/4 * 1/7
(if) 2/3 * - 5/9
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In insects like cockroaches, grasshopper, transportation of gas or gaseous exchange take place by a special type of fine tubes is called tracheae. A majority of aquatic animals like fish and prawns breathe through special organs called gills. ... Gills contain blood vessels which help in exchange of gases.
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