Insects (from Latin insectum, a calque of Greek ἔντομον [éntomon], "cut into sections") are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. They are 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 animal life forms on Earth. Insects may be found in nearly all environments, although only a small number of species reside in the oceans, a habitat dominated by another arthropod group, crustaceans. COUNT 10
QSN1 In what phylum are insects classified?  ANS1 arthropod QSN2 How many parts comprise the body of an insect? ANS2 three-part QSN3 In addition to the head and abdomen, what is the other major section of an insect's body? ANS3 thorax QSN4 What type of exoskeleton do insects have? ANS4 chitinous QSN5 How many pairs of jointed legs do insects have? ANS5 three QSN6 What does insect mean in latin? ANS6 cut into sections QSN7 What is the Latin word for insect? ANS7 insectum QSN8 Insects are a class of what? ANS8 invertebrates QSN9 Insects have what kind of skeleton? ANS9 chitinous exoskeleton QSN10 An insects 3-part body includes a throat, abdomen, and what? ANS10 head