1. record of daily activities.   log   incline   pterodactyl   touchstone   Hint Half-n-half Clue   2. violent disturbance or agitation.   insomnia   turbulence   phenomenon   mammal   Half-n-half Clue   3. change or introduction of novelties.   vent   refraction   placebo   innovation   Half-n-half Clue   4. observed fact or occurrence subject to scientific study.   phenomenon   projectile   quagmire   perimeter   Half-n-half Clue   5. optical illusion due to atmospheric conditions.   nutrient   transition   mirage   parallelism   Half-n-half Clue   6. animal that nurses its young in a pouch.   marsupial   trough   plasticity   panacea   Half-n-half Clue   7. combining elements to produce whole system.   mirage   sextant   solvent   synthesis   Half-n-half Clue