Fill in the Blanks Jobs in Nature SummaryOnline version Copy and complete with these words: by Javier Grande 1 inactive fishing primary farming crop irrigated Ploughing activity animal livestock farming The population can be divided into active and . The active population works in three economic sectors : , secondary and tertiary . Jobs in the primary sector are , and . . Crop farming is the of growing plants to obtain different products . Crops are classified into dry crops and crops . The most important stages in the process of farming are : , sowing and harvesting . Animal farming is farming . Livestock farming can be extensive or intensive .