1. Fastest fish   Shark   Eel   Cosmopolitan Sailfish   Swordfish   Bluefin Tuna   Hint Half-n-half Clue   2. Most common blood group in humans   A -   AB -   A +   B +   O   Half-n-half Clue   3. Fastest growing plant   Banyan   Palm   Ferns   Coconut   Bamboo   Half-n-half Clue   4. Largest land animal   Lion   Hippopotamus   Giraffe   Elephant   Rhinoceros   Half-n-half Clue   5. Largest muscle in the human body   Stapedius   Sartorious   Cardiac Muscles   Gluteus Maximus   Calf Muscles   Half-n-half Clue   6. Heaviest dog (breed)   German Shepherd   Irish Wolfhound   English Mastiff or St. Bernard   Great Dane   Bull Dog   Half-n-half Clue   7. Slowest mammal   Millipede   Three-toed Sloth   Snail   Man   Tortoise   Half-n-half Clue