few plants species (certain crops). Grazing modifies the structure and species composition of grasslands. Either type of agriculture can lead to desertification. Clearing forests removes the food‚ shelter‚ and other resources that forest dwelling organisms need to survive. Farming‚ logging‚ and road building‚ and other type of human land use and development often intrude into forested habitats‚ for example‚ breaking up a continuous expanse of forest into an array of fragments‚ or patches. Animals
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Why are Living Organism so Diverse ? Regardless of world’s life diversity‚ we all‚ from the ant to the whale and us humans have DNA linkage‚ which gives us the evidence for one common ancestor. The question that comes up now is how from this very primitive common ancestor did we all end up so diverse. Biologist have dedicated they life to answer this question‚ Through this essay I shall show how through different aspects life has become so diverse. Timescale Life as not evolve suddenly from its
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America‚ The Free? Our country‚ founded on the premise that we are all created equal‚ endowed by our creator‚ with certain unalienable rights isn’t holding true to its declaration. In a recent study conducted by The University of Virginia‚ almost one in four Americans polled do not believe that all men are created equal. Equality in this country has been an issue long debated and dates back to the beginning of our founding‚ starting with women’s rights. Recently‚ the virus of inequality has spread
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integration through hormones. In this chapter‚ you will learn about the neural system of human‚ mechanisms of neural coordination like transmission of nerve impulse‚ impulse conduction across a synapse and the physiology of reflex action. 316 BIOLOGY 21.1 NEURAL SYSTEM The neural system of all animals is composed of highly specialised cells called neurons which can detect‚ receive and transmit different kinds of stimuli. The neural organisation is very simple in lower invertebrates. For
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Majeed Thaika Year 10-11 ------------------------------------------------- Contents 1 Cells…………………………………………………………………….…..pg-05 -Animal and plant cells (pg-05) -Specialised cells (pg-06) -diffusion (pg-07) -osmosis (pg-08) 2 Plants…………………………………………………………..………….pg-09 -photosynthesis (pg-09) -Factors affecting photosynthesis (pg-10) -Plants and minerals (pg-11) 3 Food Chains and Cycles………………………...………………….pg-12 -Food chain (pg-12) -Energy transfer (pg-13) -Pyramids of biomass
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There are mainly following types of pollutions: 1. Air Pollution 2. Water Pollution 3. Chemical Pollution 4. Land Ozone-sphere Pollution 5. Land and Soil Pollution 6. Food Contaminants 7. Noise Pollution 8. Modern Pollutions 1. Air Pollution: The major component of the biosphere is air without which no life can survive (except some lower forms of Bacteria). Without air of good quality there cannot be a healthy life. Yet clean air is a rare commodity today. Air pollution is as old as
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Biological Science‚ 4e (Freeman) Chapter 1 Biology and the Tree of Life 1) Which of the following statements about cells is true? A cell is _____. A) only found in multiples of two‚ because single cells cannot exist independently B) always between 200 and 500 micrometers in diameter C) characteristic of eukaryotic but not prokaryotic organisms D) characteristic of both prokaryotic and eukaryotic organisms Answer: D Reference: Section 1.4 Bloom’s Taxonomy: Level 1 Knowledge 2)
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Relationship between organisms and environment Mai Po Nature Reserve is an internationally significant wetland which is actually a flat shallow estuary‚ at the mouth of Sham Chun River‚Shan Pui River and Tin Shui Wai Nullah. Its 380 hectare area with diverse habitats provides a conservation area for mammals‚ insects‚ amphibians‚ reptiles and over 380 species of birds‚ some of which are highly endangered. During the field trip‚ we visited five different habitats‚ including fishponds‚ mangroves
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all started from atoms‚ a strike of lightning and macromolecules. Carbon atoms have four valence electrons allowing them to form strong covalent bonds with many other elements‚ including hydrogen‚ oxygen‚ phosphorus‚ sulfur‚ and nitrogen. Living organisms are made up of molecules that consist of carbon and these three other elements. Carbon atoms can also bond to each other‚ which gives carbon the ability to form millions of different large and complex structures. Many of the organic compounds in
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Chapter 9 1. Organisms that can manufacture their own chemical energy sources are called _____________. 2. ________ depend on energy stored in chemical bonds by autotrophs for their food energy. 3. Simple molecules are further broken down in cells in a process called _________‚ during which energy stored in their chemical bonds is used to power the production of ATP. 4. Glucose is broken down to carbon dioxide and water in organisms which breathe air in a process called as ________ respiration
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