the earth; list the conditions‚ which make the earth a unique planet for supporting life; describe the sequence of steps in the origin and evolution of life prior to the appearance of humans; explain the term environment; enumerate the various biotic and abiotic constituents of the environment. 1.1 EARTH AS PART OF THE UNIVERSE AND THE SOLAR SYSTEM Our earth‚ with all its diversity alongwith other planets and their satellites‚ the sun‚ the moon‚ the many galaxies (huge groups of millions of stars)
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Overview: Earth’s Fluctuating Populations • To understand human population growth‚ we must consider general principles of population ecology • Population ecology is the study of populations in relation to environment‚ including environmental influences on density and distribution‚ age structure‚ and population size • The fur seal population of St. Paul Island‚ off the coast of Alaska‚ has experienced dramatic fluctuations in size Dynamic biological processes influence population density‚ dispersion
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Specific objectives 1. Define crustal plates A crustal plate is a rigid layer of the Earth’s crust that is believed to drift slowly. 2. Name and locate the Caribbean adjacent plates. Plates adjacent to the Caribbean plate are South American plate which is located south of the Caribbean plate‚ North American plate which is located north of the Caribbean plate‚ Nazca plate which is locate west of the Caribbean plate and the Cocoa plate which is located south west of the Caribbean plate. 3. Distinguish
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A habitat is the place where an organism exists. 5. A population is a group of the same species occupying a certain area. 6. A community consists of all populations at one locale (e.g.‚ a coral reef population). 7. An ecosystem contains the community organisms and abiotic factors (e.g.‚ energy flow‚ chemical cycling). 8. The biosphere is the layer on the earth where living organisms can live. 9. Modern ecology is both descriptive and predictive‚ with applications to wildlife management‚ agriculture
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What are the ABCs of Ecology? Abiotic‚ Biotic‚ and Cycles 3. What are the characteristics and needs of living things? Needs: Water‚ food‚ sunlight‚ shelter Characteristics: movement‚ respiration‚ nutrition‚ irritability‚ growth‚ excretion‚ reproduction‚ death 4. Arrange the following from smallest to largest: population‚ biome‚ organism‚ community‚ ecosystem. Organism‚ population‚ community‚ ecosystem‚ and biome. Ecosystems: 1. Define the following: a. niche-
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Its is predicted by scientsists that that a lower intensity will lower the rate of growth in duckweed. The process in testing for this is dependant on two factors‚ abiotic and biotic. In study of Lemna minor ‚ it is observed that the growth of duckweed does not only rely on the intensity of light‚ but also heavily depends on abiotic factors suh as tempature‚wind water‚ and evn oxygen levels. Plants that typically receive more light will usually gain a higher rate per capita growth‚ whicjh means
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meaning where they live. To live in a basic habitat an organism must have access to the basic requirements necessary for growth and reproduction. The environment supplies these requirements. The environment of organisms consists of both abiotic factors and biotic factors.
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Planet Earth contains three compositional layers- CORE‚ MENTLE & CRUST. Core: At the centre is the densest of the three layers‚ the core. The core is a spherical mass‚ composed largely on metallic iron‚ with lesser amount of nickel and other elements. Mantle: The thick shell of dense‚ rocky matter that surrounds the core is mantle. The mantle is less dense than the core but denser than the outer most layer‚ the crust. Crust: Above the mantle lies the thinnest and outermost layer‚ the crust
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building materials)‚ regulating services (the ability of plants to remove human-added carbon dioxide from the atmosphere)‚ support services (pollination of crops) * Intrinsic: no direct benefit but the belief that individuals‚ species‚ and ecosystems are inherently valuable in themselves and we have an obligation to preserve them * The world has experienced 5 major extinctions during the past 500 million years and we are currently in another * Extinction – when the last member of a species
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are Natural Resources? 4. There are various methods of categorizing natural resources‚ these include source of origin‚ stage of development‚ and by their renewability. On the basis of origin‚ resources may be divided into: (f) Biotic – Biotic resources are obtained from the biosphere (living and organic material)‚ such as forests and animals‚ and the materials that can be
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