1. Define ecology. Identify the two features of organisms studied by ecologists. Ecology is the scientific study of the interactions between organisms and the environment‚ which in turn determine both the distribution of organisms and their abundance. Ecologists study how interactions between organisms and the environment affect phenomena such as the number of species living in a particular area‚ cycling of nutrients in a habitat‚ and the growth of populations. 2. Describe the relationship between
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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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queen is much larger F Organisms Are Composed of Cells 1.3 Cells are the fundamental unit of living things 9 THE GENE THEORY: Genes Control the Traits of Organisms 1.4 Organisms have a genetic inheritance 10 THE THEORY OF HOMEOSTASIS: Organisms Are Homeostatic 1.5 Organisms regulate their internal environment 11 THE THEORY OF ECOSYSTEMS: Organisms Live in Ecosystems 1.6 The biosphere is divided into ecosystems 12 THE THEORY OF EVOLUTION: Organisms Are Related and Adapted to Their
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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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‘the inert/non-living’ from ‘the living’ of which a an organism has to posses in order for it to be considered as a living being. These include self organization or movement‚ growth‚ reproduction‚ inheritance‚ feeding‚ excretion‚ sensitivity and adaptation. Moreover‚ the question of what life is takes us back to evolution‚ that is‚ for an organism to be considered living‚ it has to be part of the fossil record. Even so‚ there are living organisms which do not show some of these characteristics of life
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LIFE ON EARTH REVISION Analysis of the oldest sedimentary rocks provides evidence for the origin of life. - Identify the relationship between the conditions on early Earth and the origin of organic molecules. - Formation of the organic molecule was the first event in the evolution of life. - The molecules provided a building block for cell formation and the food for the earliest life. - Present day life’s atmosphere contains: - Oxygen - Water - Carbon
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2:30-3:30 TTHS Levels of Organization in Organism In unicellular (single-celled) organisms‚ the single cell performs all life functions. It functions independently. However‚ multicellular (many celled) organisms have various levels of organization within them. Individual cells may perform specific functions and also work together for the good of the entire organism. The cells become dependent on one another. Multicellular organisms have the following 5 levels of organization ranging
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mainly about the different species he saw on the Galapagos Islands. Each island had a different variation of birds. He noticed that the beak sizes of the finches were different on each island because of the size seeds they ate. Darwin noticed that organisms reproduce more offspring than can survive. Each individual offspring has unique characteristics that can be hereditable. Most of Darwin’s observations focused on the idea of natural adaptions. Darwin noticed that the body parts an animal used
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Ecosystems at Risk Ecosystems and their functioning What is an ecosystem? Ecology – the science that examines the interactions between organisms and their living (biotic) and non-living (abiotic) environment. Groups of organisms and their biophysical environment interact and exchange matter and energy. Ecosystem – the dynamic complex of plant‚ animal and micro-organism communities and their non-living environment as a functional unit. Ecosystems are dynamic; constantly changing and adapting. Ecosystems
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8.4 Life On Earth Students Learn About 1. Analysis of the oldest sedimentary rocks provides evidence for the origin of life • Identify the relationship between the conditions on early Earth and the origin of organic molecules Notes THE AGE OF THE EARTH - based on geological‚ magnetic‚ radiographic and paleontological studies: aged 4.5 billion years - Hadean eon: formation of earth from gaseous cloud to solid body. Heavy molten iron sank down and became the core‚ lighter rock came to surface = crust
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