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Articulated invertebrate animal which have the characteristic of breathing through trachea. Some insects have become aquatic (representing 3% of insects) but have retained this aerial breathing.
Animal visible to the naked eye (ie larger than 0.5 mm) that does not have a skeleton, bone or cartilage.
Aquatic vertebrate that breathes through gills and has both limbs represented by fins (pectoral and pelvic). Fish are usually oviparous.