3.0 APPRECIATIONFirst of all, thanks to my Biology teacher, Miss Norma Bt. Selimin for being such good guider for us while we were doing this task. She had given us appropriate example and knowledge in order to make us understand more about this ecological study. We take some idea from the past years students work. She spends her time to carry out each and every experiment related to this ecological study. She also makes sure that we understand everything she told and gives some explanation before we begin to work on these practical assessments.I also appreciate the school authority for giving us permission to carry out experiment in school laboratory and going our quadrates and transect sampling technique in school ground. School also provided all the apparatus and materials that we used in the ecological study task.

I also want to thank to my classmates who are willing to share their information about this ecological study. They give me a lot of ideas about the tasks and I use all their information especially in transect sampling technique which required us to work together in order to complete the ecological study folio.

Also, a great thanks to my parents Haja Nazymudeen and Rabiyathul Basirya who tried their best to give their support either by giving me a lot of encouragement for keep us with this task or by supporting the financial for use to pay all the cost required to complete this ecological study.

9.1.Human Activities that Endanger an Ecosystem

Human Activities Rapid development in the field of medicine, modern agricultural technology and infrastructure increase the world population. Because of rapid development, human activities continue to increase. Without careful planning, these activities will threaten the ecosystem. Human activities that can threaten other living things and the environment.

9.0. ENDANGERED ECOSYSTEM(Chapter 9)9.1.Human Activities that Endanger an Ecosystem

Human Activities Rapid development in the field of medicine, modern agricultural technology and infrastructure increase the world population. Because of rapid development, human activities continue to increase. Without careful planning, these activities will threaten the ecosystem. Human activities that can threaten other living things and the environment.

9.2. The Greenhouse Effect and the Thining of the Ozone LayerThe Greenhouse Effect 1. Sunlight reaching the Earth will warm up the Earth.2. The heat produced will be reflected back to space as infrared radiation.3. The presece of greenhouse gases such as carbon dioxide, chlorofluorocarbons (CFCs), methane, nitrogen oxides and ozone in the atmosphere will trap and reflect heat back to Earth`s surface.4. Extensive human activities such as burning of fossil fuels and deforestation increase the amount of carbon dioxide and cause Earth`s temperature to increase.5. The effect of the accumulation of greenhouse gases results in the melting ince and glaciers at the Poles thus increasing the sea levels. As a result, lowland areas will be flooded.

Thinning of the Ozone Layer 1. The ozone (O3) layer is a protective layer to humans and all living things from ultraviolet rays (UV) of the sun.2. Thinnning of the ozone layer occurs as a result of the releaseof CFCs, chemical compounds containing chlorine (Cl), carbon (C) and fluorine (F).3. CFCs are used widely in refrigeration system (such as refrigerators and air conditioners) and aerosol sprays (such as insecticide sprays and fire extinguishers).

9.3. The Importance of Proper Management of Devolopment Activities and the EcosystemEffect of Increasing Population 1. Rapid population growth requires additional of food, housing, education, medicine, energy, transport and other developments of infrastructure2. Forests are cut down to provide areas for rapid development such as road construction, plantation, dams and residential areas to meet the demands of the population.Managements of Development and the Balance of Nature1. Planning for land or industrial development should be done carefully and long term effect on the environment should be considered,2. The development of a country can be managed in the following ways:a) Implementation of laws to protect the natural resourcesb) The development of technology such as the use of lead free fuels, biomass fuels and sewage treatment to reduce and overcome the problem of environmental pollutionc) Education on the management of resource such as the 3R campaign (reduce,reuse and recycle) to manage the materials usedd) Preservation and conservation of the natural resources such as soil, water, flora and fauna of forest and mangrovee) The efficient use of energy by using renewable energy such as solar energyf) Practising biological control to reduce the release of harmful chemicals in controlling pests3. Protection of the ecosystem through beneficial activities to educate and enlighten the public to protect the environment by conducting campaigns.