Context: 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.

Question: How does the lifecycle of most insects typically begin?
Answer: hatch from eggs

Question: What is the primary constraint on the physical growth of an insect?
Answer: inelastic exoskeleton

Question: What stage of development differentiates a 4-stage metamorphosis from a 3-stage metamorphosis, notably absent in the latter?
Answer: pupal stage

Question: What is the term given to denote the series of stages involved in the development of an adult insect?
Answer: nymphal

Question: What era is attributed to the findings of enormous fossilized dragonflies with extremely long wingspans? 
Answer: Paleozoic

Question: Insects hatch from what?
Answer: eggs

Question: Insects growth is constrained by what?
Answer: the inelastic exoskeleton

Question: An insects developement involves a series of what?
Answer: molts

Question: How many stages of metamorphosis does an insect go through?
Answer: 4-stage

Question: The most diverse insects coevolved with what?
Answer: flowering plants