Tolerant & Very Tolerant
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(Left to right) The first picture is a picture of a Scud a Scud is a tolerant bug. The next picture is a Water Strider and a Water Strider is a very tolerant bug
Tolerant and very Tolerant are two of the sensitivities of the bugs. Tolerant means not sensitive to pollution. So if the bug were not sensitive it would be a tolerant bug.
Very tolerant means not sensitive at all to pollution. So if you put a very tolerant bug in a polluted stream it would be fine and not have a problem living in the stream.