Study the diagrammatic representation given below of the Earth with regions marked 'A' and 'B' respectively. Answer the questions that follow. (a) Write the observations made regarding the species diversity when moving from region 'A' to region 'B'. Give two reasons also. (b) Stating the reason, mention the approximate number of bird species recorded in India. or (b) Name the region in the world that records the greatest biodiversity and mention why.