Insects, 6 legs, Head, Thorax, Antennae, Wings may be present, Simple or complete metamorphosis, Cuticle made of chitin, Respiration via spiracles and trachea, Abdomen, Arachnids, 8 legs, No antennae, Cephalothorax, Separate Abdomen, Larvae have three pairs of legs, Scutum present in hard ticks, Males smaller than females

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