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Interdependence and adaptation
The mayfly larva needs clean water to survive. This means that it can be used as:
an indicator species for water pollution
food in fish farms
a direct measurement of pollutant levels
How do lichens indicate levels of air pollution?
Only bushy lichens can grow in very polluted air.
Lichens cannot grow at all in very polluted air.
Most lichens grow best in very polluted air.
One advantage of using a temperature probe and datalogger, rather than a thermometer is:
it provides more accurate measurements of temperature
it records the temperature automatically
it is cheaper and easier to use