In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), what does the three names, indica, tuberosum and leo, represent?
A post-man starts cycling from his post office. He cycles 7 km South, then turns West and cycles 5 km, Then turns North and cycles 6 km, then turns to his right and cycles 5 km. Where is he now with reference to his post office?