Their success as insects results, in part, from the large number of eggs they lay. Depending on the species, dragonflies lay hundreds of eggs by dropping them into the water and leaving them to hatch or by inserting eggs singly into a slit in the stem of a submerged plant. Nymphs are often covered by algal growth. They are voracious predators. Its skin splits along a midline of the thorax, and the adult dragonfly emerges.
Science is constructed of facts as a house is of stones.
But a collection of facts is no more a science than a heap of stones is a house. After you've attracted some dragonflies, very carefully capture one. Then, using a jeweler's loupe or magnifying glass, examine its wings. Write a story about the dragonfly. Exploring the World of Insects, Adrian Forsyth, 1992.