answer:I would say (I’m not schooled in this field, but I do know some information) arthropods, over the years have developed different parts of their brains to adapt. Taste & smell are more important & beneficial for a large group of these creatures. They have developed what’s called mushroom bodies, or the scientific name (corpora pedunculata). This is the part of the brain that handles learning, memory & smell. Take ants for example. You may not be able to teach an ant to sit & shake at the sound of your voice, but if you create a scent trail, they will remember that trail for as long as it remains active. Evolution is all about the ability to survive. For arthropods, to survive – is more dependent on taste & smell. It’s important to remember where you last found food & picking up the scent of your next meal. So that part of their brain developed more than the rest. As for other animals that do take verbal commands, I’m not entirely sure, but it probably is a mix between similarities in brain development & a little evolution. Animals with very similar brain construction, like a gorilla, have been taught to converse with humans, like the famous Koko. That’s pretty much the best answer I can provide based on what little I know. Sorry I don’t know much about the subject.