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The Silence of the Frogs 1. According to scientists about 30% of North American frogs are in trouble. 2. Based on scientific reseach it is believed that amphibians have been on earth for over 400 million years. 3. Frogs were able to survive catastrophes that other organisms were not because of their ability to live on both land and water. 4. An ecosystem is defined as the relationship among many species living in a specific area and the relationship between the species and the non living components of the environment. 5. Scientists are concerned about the decline because frogs provide information about both land and water ecosystems. Thus, the health of frogs may well indicate the health of the 2 ecosystems they live in. 6. Amphibian means “ 2 lives.” 7. Frogs may in twice the danger of other organisms because they live in both land and water during their life. 8. Malaria is a disease carried by mosquitoes. The disease affects humans. 9. The increase in malaria can be linked to frogs as frogs eat mosquitoes. Less frogs means more mosquitoes. More mosquitoes means more malaria. 10. A detritus food chain is one involving decomposers. The decomposers return nutrients back into the environment. 11. There are 4 main reasons why frogs are disappearing: a) loss of habitat – place where frogs live are being used for industry, homes, farmland and highways. b) air and water quality – pollution has caused several problems with frogs as pollutants easily pass through a frogs skin. Acid rain has also affected the development of eggs laid in water containing high acid levels as it affects sperms ability to swim as well as embryos often show deformities c) ultraviolet radiation – uv radiation causes skin burns which has then been linked to cell damaged. d) climate change – global warming has caused different areas to become dryer frogs begin to dry out and eventually die. 12.The graph on page 12 shows the decline of frogs in an area where deforestation occurred between 1985 and 1986.