The life cycles of insects vary but most hatch from eggs. Insect growth is constrained by the inelastic exoskeleton and development involves a series of molts. The immature stages can differ from the adults in structure, habit and habitat, and can include a passive pupal stage in those groups that undergo 4-stage metamorphosis (see holometabolism). Insects that undergo 3-stage metamorphosis lack a pupal stage and adults develop through a series of nymphal stages. The higher level relationship of the Hexapoda is unclear. Fossilized insects of enormous size have been found from the Paleozoic Era, including giant dragonflies with wingspans of 55 to 70 cm (22–28 in). The most diverse insect groups appear to have coevolved with flowering plants. COUNT 10
QSN1 How does the lifecycle of most insects typically begin? ANS1 hatch from eggs QSN2 What is the primary constraint on the physical growth of an insect? ANS2 inelastic exoskeleton QSN3 What stage of development differentiates a 4-stage metamorphosis from a 3-stage metamorphosis, notably absent in the latter? ANS3 pupal stage QSN4 What is the term given to denote the series of stages involved in the development of an adult insect? ANS4 nymphal QSN5 What era is attributed to the findings of enormous fossilized dragonflies with extremely long wingspans?  ANS5 Paleozoic QSN6 Insects hatch from what? ANS6 eggs QSN7 Insects growth is constrained by what? ANS7 the inelastic exoskeleton QSN8 An insects developement involves a series of what? ANS8 molts QSN9 How many stages of metamorphosis does an insect go through? ANS9 4-stage QSN10 The most diverse insects coevolved with what? ANS10 flowering plants