Background Paragraph: Scientists think that the earliest flowers attracted insects and other animals, which spread pollen from flower to flower. This greatly increased the efficiency of fertilization over wind-spread pollen, which might or might not actually land on another flower. To take better advantage of this “animal labor,” plants evolved traits such as brightly colored petals to attract pollinators. In exchange for pollination, flowers gave the pollinators nectar. 
Story: Last week, John visited the national park near his city. He saw many flowers. His guide explained him that there are two categories of flowers, category A and category B. Category A flowers spread pollen via wind, and category B flowers spread pollen via animals.
Which flower would give nectar to the pollinators, category A or category B? Which flower would have higher efficiency of fertilization, catergory A or category B? Which flower would have less colorful petals, category A or category B? Which flower would have lower efficiency of fertilization, catergory A or category B? Which flower would have more colorful petals, category A or category B? Which flower would not give nectar to the pollinators, category A or category B? Would category A flower have higher or lower efficiency of fertilization than category B flower? Would category A flower have more or less colorful petals than category B flower? Would category B flower have higher or lower efficiency of fertilization than category A flower? Would category B flower have more or less colorful petals than category A flower?