Explanation:
Lichen is the best species to determine the pollution of air. They are highly sensitive to pollution and will barely be found growing on trees or rock in regions where the air has been polluted.
Worms are also a good indicators of pollution in the soil. Polluted soils will have very few to no worms.
Small invertebrates like the Caddisfly are used to determine pollution of water. They are very sensitive to water pollution and cannot be found in polluted waters. In addition toads and frogs are rare in polluted waters and air.
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D. diversity of the resources in the habitat.
Explanation:
The deforestation brings in lot of problem, much more than it brings in benefits for the humans on the long run. Once a forest is totally destroyed, the habitat suddenly loses the majority of its resources, especially for the organisms that are consumers. The soil too gets rapidly degraded, so the majority of the producers too find it very hard and takes them long time to reestablish themselves.
Having the diversity of resources dwindle, the organisms suffer badly. All living creates need resources in order to survive, so once they don't have them they die out. This unfortunately happens all over the world, with the tropical rainforest habitats being the most endangered, especially in the Amazon, Congo, and Southeast Asia.
When the starfish were removed from the area as part of an experiment, the mussel population swelled and crowded out other species. The biodiversity of the ecosystem was drastically reduced. Payne's study showed that identifying and protecting keystone species can help preserve the population of many other species.
Answer: well they give nutrients to the body to help the human body to grow and stay healthy.
