1. archaeology   physical structure of plants, animals, etc.   matter and its properties   antiquities   atmosphere and related phenomena   Hint Half-n-half Clue   2. ecology   origin and development of human race   relation of living forms to the surroundings   words with their origin and history   secret writings   Half-n-half Clue   3. economics   map-making   supply and demand of goods and services   sound   fungi and related diseases   Half-n-half Clue