Because mal in animal comes from mammals and ani comes from something that god knowsWe get it from the Latin, Anima, to breath, and animale, living, animate.From...
Aside from the common invertebrates we know like insects, cnidarians, molluisks, echinodrms, etc... there are also chordates that do not have vertebrae for example, the tunicates(urochordata) and the...