insects are a class of living creatures that have three-part body head,thorax and abdomen, three pari of jointed legs, compound eyes,and one pair of antennae. they are among the most diverse group of animals on the planet,including more than a million described species and representing more than half of all known living organisms.the number of extant species is estimated at between six and ten million,and potentially represent over 90% of the differing metazoan life forms on earth.insects
may be found in nearly all environments,although only a small number of spicies occur in the oceans insects typically move about by walking,flying or sometimes swimming. as it allows for rapid yet stable movement,many insects adopt a trihedral gait in which they
walk with their legs touching the ground in alternating triangles,many insects spend at least part of their lives underwater,with larval adaptations include gills,and some adult insects are aquatic and have adaptations of swimming