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so bio-indicators i think are actually

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really cool it's this idea that things

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in biology so in our biosphere plants or

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animals might indicate tell us something

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about our environment or maybe even

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changes to that environment and so one

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example is here at the Virginia living

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museum we have the ozone bio indicator

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garden and there are plants that are

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highly susceptible to damage from being

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in contact with ozone and so ozone can

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happen at the ground level and that's

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bad for us as humans and that's also bad

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for some plants they don't want to be

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breathing in that ozone filled air and

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what we see happening is on the plants

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if you turn them over they get almost

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bruises so to speak it's called

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stippling that happens on the back of

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them and so if we see that it's an

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indicator to us that there are high

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concentrations of ozone in our

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environment