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: Scientists studied two groups of plants. Group F had plants with flowers, group W had plants that fertilize over wind- spread pollen. Flowering plants were more efficient.
Which group of plants attracts fewer animals? Which group of plants attracts fewer insects? Which group of plants attracts more animals? Which group of plants attracts more insects? Which group of plants didn't give the pollinators nectar? Which group of plants gave pollinators nectar? Which group of plants has a higher fertilization efficiency? Which group of plants has a lower fertilization efficiency? Which group of plants has fewer brightly colored petals? Which group of plants has more brightly colored petals?