Organisms that provide an early warning of environmental damage are?

Indicator species are those organisms that provide an early warning of environmental damage. These species are sensitive to changes in their environment and can therefore indicate when pollution, climate change, or other environmental stressors are present. Some indicator species include:

- Lichens: These organisms are sensitive to air pollution and can be used to monitor changes in air quality.

- Birds: Birds are sensitive to changes in their habitat and can be used to monitor changes in forest cover or other land use changes.

- Fish: Fish are sensitive to changes in water quality and can be used to monitor pollution in rivers and lakes.

- Bees: Bees are sensitive to pesticides and other environmental stressors and can be used to monitor changes in agricultural practices.