1. Each of the hind feet of a frog has 4 toes.   True   False   2. Frogs have _______ as their hearing organs.   lateral lines   sensitive feelers   external eardrums   Hint Half-n-half Clue   3. _______ animals spend much of their time in air.   Aquatic   Aerial   Arboreal   Half-n-half Clue   4. A bull is angered by the color of a red cloth.   True   False   5. A long-sighted person can see a distant object but has difficulty in seeing a near object.   False   True   6. Mammals have _______ glands which secrete milk.   mammary   pituitary   adrenal   Half-n-half Clue   7. Our vision is _______.   binocular   triocular   monocular   Half-n-half Clue