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butterflies are insects therefor they have 6 legs
Yes. All butterflies are insects. Yes
All insects molt until they have reached the adult stage.
They lay many eggs to make sure some survive to be adults. Most of the young insects do not make it to adult stage.
only adult insects have wings
Two. All adult insects have them, even if they're not visible - for example insects with very good vision like flies and dragonflies have very short ones as they don't need to feel around very much, but they still have to smell (which is done with the antennae).
all insects are coldblooded
GLOWORMS: Gloworms eat other insects, slugs and snails ADULT FIREFLIES: Adult Fireflies eat other insects, pollen, flower parts or nothing at all http://highlightskidsplus.com/Science/ScienceQuestions/h1sciQfireFlies.asp
Hemimetabolous insects have a gradual change from larva to adult and the larva resembles the adult it will become. Holometabgolous insects have a pupal instar and the larva does not resemble the adult.
All insects have an exoskeleton, as it is one of the defining characteristics of almost all arthropods, and seeing as insects are arthropods, you can bet that all insects DO have exoskeletons.
yes
Insects have 4 stages: egg, larva, pupa, and adult.