The use of the chemical‚ dichloro-diphenyl-trichloroethane (DDT)‚ is a prime example of how public health benefits and environmental costs tradeoff. DDT was extensively used worldwide beginning in the 1940’s as a means to kill insects; it was also used to prevent malaria from spreading and control agriculture pests. DDT became so popular that at one point the U.S. was the leading producer‚ developing thousands of metric tons of DDT. With years of scientific research‚ researches came to find that
Premium DDT Environmentalism United States Environmental Protection Agency
Communities and Ecosystems 37.1 Multiple Species Interact in Communities ~Communities are composed of coexisting populations of multiple species ~An ecosystem consists of a biotic community plus its abiotic environment ~Each species in a community has a place where it normally lives and a set of resources necessary for its life activities ~Ecologists describe the diversity of a community by measuring species richness and the relative abundance of each species. * Populations interact in many
Premium Ecosystem Food chain Ecology
of the animals through the process of bioaccumulation. In fact‚ several studies have shown links between environmental exposure and high levels of dioxins in animals in both terrestrial and aquatic habitats. As seen in the image to the right (Biomagnification‚ Bioaccumulation‚ and Research Motivation‚ 2015). This is problematic because if the surfaces of common plants are exposed from runoff or soil contamination
Premium Agent Orange Vietnam War
1. What are confounding variables? 2. What are experimental controls? 3. What is the difference between a scientific fact‚ law‚ and theory? 4. What are the ’norms’ of science? 5. What are the differences between the four common types of organic molecules? 6. Why do cells make ATP? 7. How can you distinguish between prokaryotic and eukaryotic cells‚ and between haploid and diploid cells? What types of cells fall into these categories? 8. What is the function of cellular respiration? Where
Premium DNA Evolution Gene
Name:__________________________________________________________________ Block: _______ Ecological Pyramids Worksheet 1. Give one example of a food chain that exists in nature. Grass-mouse-snake-hawk 2. In an ecological pyramid‚ what happens to energy‚ biomass and # of species as you move up? Why? They all decrease because energy is lost as it moves up each trophic level. Each trophic level requires more energy to sustain it‚ increasing competition for resources and causing number of
Free Food chain Ecology Trophic level
ECOSYSTEMS BIODIVERSITY- the variety of life on Earth and the essential interdependence of all living things. Three components of biodiversity; 1. Genetic- variety within species 2. Species- all different species 3. Ecosystems- can support diversity Advantages of biodiversity Oxygen Food Clean water Medicine Aesthetics Intrinsic vs Utilitarian value Intrinsic value is something that has value in and of itself Utilitarian value is the value something has‚ as a means
Premium Ecosystem Biodiversity Plant
Lovely Professional University‚ Punjab Course Code Course Title Course Planner Lectures CHE883 ENVIRONMENT CHEMISTRY 15316::Pushp Lata Course Category Tutorials Practicals Credits Courses with numerical and conceptual focus 3.0 0.0 0.0 TextBooks Sr No Title Author T-1 Environmental Chemistry Edition Year Publisher Name Colin Baird‚ Michael Cann 4th 2008 W.H. Freeman and company Reference Books Sr No Title Author Edition
Premium Air pollution Greenhouse gas Chemistry
BIOREMEDIATION INTRODUCTION:- The process of bioremediation was reportedly devised by George M Robinson in the 1960 during experimentation with dirty jars and the introduction of microbes this was however not applied until the 1972 clean out of the fuel holding tanks on the RMS queen mary. Science 1972 bioremediation has become greater developed as a means of cleaning up spills of gasoline diesel ‚ heavy metals and other easily degraded petroleum products (National Research Council 1993). Bioremediation
Premium Aromaticity Bacteria Benzene
Name of Student: FINAL EXAM Please enter your name in the upper right cell. Read the directions carefully. Note that the exam is worth a maximum of 15 points (15% of your course grade). Some items are required‚ and some offer choices of which ones to complete. Responses must be in your own words (no copied content or quotations allowed) in the cells provided; the cells will expand downward as you type. You do not need to cite sources for this test‚ especially because no copied content is permitted
Premium Trophic level Water Food chain
consume copepods‚ then large fish eat smaller fish‚ etc. Each successive step up the food chain causes a stepwise concentration of pollutants such as heavy metals (e.g. mercury) and persistent organic pollutants such as DDT. This is known as biomagnification‚ which is occasionally used interchangeably with bioaccumulation. A polluted river draining an abandoned copper mine on Anglesey Large gyres (vortexes) in the oceans trap floating plastic debris. The North Pacific Gyre for example has collected
Premium Water pollution Pollution Water