Chiggers don’t bite, instead they use there mouths to drill holes through skin; during this process they spit to break down skin cells which is most likely the reason why it itches.
You didn't really provide us with any options? It must be noted that generally, the structure of the skeletal system also dictates its function. With that I mean that having bones and a skeletal system enables us to move more efficiently and to have the pose which we have.
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it should be the first or last one. :) good luck.
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