What is referred to by 'caravan viper dart'?

What is referred to by 'caracas buenos aires quito'? What is referred to by 'caracas tunis jakarta'? Based on the clue 'caramel is added to make the darker varieties of t...', what is the answer? Based on the clue 'caravaggio painted jesus without this usual facial...', what is the answer? Based on the clue 'carbohydrates are predominantly made up of these t...', what is the answer? Based on the clue 'carbohydrates such as sugars starch contain these...', what is the answer? Based on the clue 'carbon dioxide is swapped for oxygen in the alveol...', what is the answer? Based on the clue 'carbon in this form has every atom linked tetrahed...', what is the answer?