CHAPTER 1 : A LOCAL ECOSYSTEM What is an ecosystem? Characteristics? The size of a population of organisms? Factors for this variation? Environmental factors? An ecosystem is any environment containing living organisms that interact with each other and with the non-living parts of the environment. Largely self-sustaining. - materials and energy are exchanged via food webs. - any size. (eg. a pond‚ a forest‚ a desert or a piece of bushland.) Does not
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Aneka Khilnani September 8. 2012 Period 3 AP Biology Free Response Essay: Cell Size Life is defined as a distinctive characteristic that a living organism‚ dead organism or non-living thing‚ and it has the ability to grow‚ metabolize‚ respond to stimuli‚ adapt and reproduce. Cells are not smaller that 0.1 um because within the cell all the necessary components have to take place‚ cellular metabolism‚ reproduction‚ photosynthesis and there has to be a sufficient amount of space for that to
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Contributors to Microbiology Pioneers of Microbiology I. Antonie van Leeuwenhoek (Oct. 24‚ 1632- Aug. 30‚ 1723) A. In 1676 Leeuwenhoek saw tiny organisms in water‚ he was the first man to observe and describe bacteria accurately. He discovered microscopic nematodes‚ blood cells and sperm. He also made over 500 microscopes to view specific objects. B. Microbiology is concerned with the study of all forms of life that are too small to be seen with the naked eye. Antonie’s work
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evolutionary biologists to suggest that some organelles are descendants of free- living prokaryotic organisms that came to inhabit larger cells. Present day prokaryotes are similar to fossil prokaryotes‚ some of which are 3500 million years old. By comparison‚ the earliest eukaryote cells date back only 1000 million years. Thus eukaryotes must have evolved‚ surrounded by prokaryotes that were long-established organisms. It is possible that‚ in the evolution of the eukaryotic cell‚ prokaryotic cells came to
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Millions of species inhabit Earth. How do scientists make sense of them all? First‚ scientists study the similarities and differences between organisms. The scientists study characteristics including obvious physical traits‚ such as hair or leaves‚ and molecular traits‚ such as DNA sequences. Then‚ scientists use the information to classify species into meaningful groups. The groups may also reveal which species are related and how they fit along the evolutionary tree. Scientists who specialize in
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ENVIRONMENT A Term Paper Submitted As A Minimum Requirement In English IV TO: Mrs. Rosalie L. Bustamante (English Teacher) BY: Miko Glenn G. Saballa IV Garnet TABLE OF CONTENTS i. About the Author 1 ii. Acknowledgement 2 iii. Dedication 3 iv. Thesis Statement 4 Chapter 1 Environment A. Introduction 5 B. Background of the study 6 C. Purpose of the study 7 D. Statement of the
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most obvious statement which says that science is right is Evolution. Evolution is a scientific theory that explains the origins of humanity and its development. Evolution is where a living organism adapts and evolves to become less primitive‚ and more likely to survive. It is NOT random. Not a single living organism that has ever been discovered shows any sign whatsoever of having evolved by non-Darwinian means. Evolution
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List the qualities (at least 6) that define life AND discuss how a single-celled organism‚ such as an Amoeba or a yeast cell‚ and a more complex one‚ such as a tree or a cat‚ matches up with each characteristic 1. Living things have cells. 2. Living things grow 3. Living things reproduce 4. Living things respond to stimuli 5. Living things use energy 6. Living things adapt to their environment A single celled organism‚ such as an Amoeba‚ has a short life because of the heavy work load and exposure
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Definition of Microorganism Microorganism (from the Greek: mikrós‚ "small" and organismós‚ "organism") is an organism that is microscopic (usually too small to be seen by the naked human eye). Microorganisms live in all parts of the biosphere where there is liquid water‚ including soil‚ hot springs‚ on the ocean floor‚ high in the atmosphere and deep inside rocks within the Earth’s crust. Microorganisms are critical to nutrient recycling in ecosystems as they act as decomposers
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Biological weapons are living organisms‚ whatever their nature‚ or the materials that are created because of their use. Biological weapons can cause disease or death in living organisms‚ and are depended upon for their further ability to multiply inside the organism that it attacks. Chemical weapons are defined as chemical substances of gas‚ liquid‚ or solid which are used because of a directly toxic effect upon humans‚ animals‚ or plants. Even though the two weapons are closely related‚ chemical
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