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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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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highlighted in BOLD are the essay titles more akin to the new specification. How ATP is produced and used in living organisms. Mutation and its consequences. The adaptations of organisms that help them survive extreme conditions. Nitrogenous excretion and water control in animals. How nucleic acids are suited to their functions in living organisms. The interactions between organisms of the same and different species. How a mammal is able to see. The causes and nature of the variation on which
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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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Population is all the organisms that both belong to the same species and live in the same geographical area. The area that is used to define the population is such that inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals from other areas. Normally breeding is substantially more common within the area than across the border. Ecosystem which consists of all the organisms living in a particular area‚ as well as all the nonliving‚ physical
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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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BIOTECHNOLOGY AND ITS APPLICATIONS Biotechnology is the use of living systems and organisms to develop or make useful products‚ or "any technological application that uses biological systems‚ living organisms or derivatives thereof‚ to make or modify products or processes for specific use. For thousands of years‚ humankind has used biotechnology in agriculture‚ food production‚ and medicine.[2] The term itself is largely believed to have been coined in 1919 by Hungarian engineer Károly Ereky. In
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an organism? -It could train them to respond to certain smells and respond in a certain way. How would natural selection affect an organism’s ability to sense and respond to this stimulus? -The organism depends on its ability to sense and respond. The organisms could compete for water or hydration. What other types of stimuli would be important for the organism to respond to? - An organism that is used to light is suddenly put in darkness‚ it may search for light. If an organism that
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