Chapter 1. Describing life and science 1. Which is the correct sequence for levels of biological organization within an organism? • Atom-molecule-organelle-cell-tissue 2. Which is the correct sequence for levels of biological organization occurring beyond the individual? • Population-community-ecosystem-biosphere 3. To be considered a living organism‚ the organism must consist of • one or more cells 4. Which is not a required characteristic of life? Movement 5. “The most restrictive
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There may be just the impressions of footprints or leaf- prints and not the original part of the organism. (iv) Fossils might be also in the form of casts or mould. Conditions favourable for preservation: We know that millions of animals and plants had lived‚ died and were destroyed without leaving a trace. But it has been observed that two factors are favourable for the preservation of organisms as fossils (a) The possession of hard parts such as shells and bones‚ and (b)Quick burials
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Characteristics of Living Organisms In order to identify living organisms‚ scientists listed 7 characteristics which all living organisms have: 1. Nutrition: Taking in nutrients which are organic substances and mineral ions‚ containing raw materials and energy for growth and tissue repair‚ absorbing and assimilating them. 2. Excretion: Removal from organisms of toxic materials‚ the waste products of metabolism and substances in excess. 3. Respiration: Chemical reactions that break
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characteristic that distinguishes that have signaling and self sustaining processes from those that don’t. If an organism can perform certain functions such as movement‚ respiration‚ sensitivity‚ growth‚ reproduction‚ excretion‚ and nutrition‚ it is classified as a living organism. Life began from the basic building block of all living things‚ called cells. All organisms derived from single celled organisms. Cells are the basic building blocks of life and are found in all living things. For example‚ a group
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took place‚ and a lot of it was due to natural selection and how our bodies and traits changed over time to deal with the new challenges faced everyday. According to the New World Encyclopedia "Natural selection is the process by which biological organisms with favorable traits survive and reproduce more successfully
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12/16/13 Abstract This experiment was used to explore the Theory of Evolution created by Charles Darwin. The use of natural selection was apparent in the artificial modification of an organism ’s traits which aided in this investigation. Through this experiment the Wisconsin Fast Plant was used. It is a fast-growing organism developed to improve the resistance to disease in cruciferous plants. This plant aids scientist in the exploration of environmental effects on population due to the speed to which
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(Verhoef‚ 2010). Krebs (1972) described a community as an assemblage of populations of living organisms in a prescribed area or habitat. However‚ according to Wright (1984)‚ the working definitions of community can be divided into two basic categories: organismic or individualistic. The organismic approach contends that communities have discrete boundaries and that the sum of the species in an area behaves as organism with both structure and function. In contrast‚ the individualistic concept regards communities
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Anything which we eat to live is called food. Food contains energy. The food (or energy) can be transferred from one organism to the other through food chains. The starting point of a food chain is a category of organisms called producers. Producers are‚ in fact‚ plants. So‚ we can say that all the food chains begin with a green plant (or grass) which is the original source of all food. Let us take an example to understand the meaning of food chain. Suppose there is a field having a lot of green
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natural science concerned with the study of life and living organisms‚ including their structure‚ function‚ growth‚ evolution‚ distribution‚ and taxonomy. * The cell is the basic structural and functional unit of all known living organisms. It is the smallest unit of life that is classified as a living thing (except virus‚ which consists only from DNA/RNA covered by protein and lipids)‚ and is often called the building block of life. Organisms can be classified as unicellular (consisting of a single
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a lot of controversy on whether or not a virus is a living or non-living organism. The dictionary.com definition for life is‚ “the condition that distinguishes organisms from inorganic objects and dead organisms‚ being manifested by growth through metabolism‚ reproduction‚ and the power of adaptation to environment through changes originating internally.” Viruses have characteristics of both living and non-living organisms‚ for example‚ a living characteristic includes reproduction. A non-living
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