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Cells and Systems Notes
Cells and Systems Notes

... Larynx – Place where moving air being breathed in and out creates sounds Trachea – This is the windpipe, or the passage leading from the mouth and throat to the lungs Lungs – The lungs perform respiration or gas exchange Bronchi or Bronchus – The two main tubes of the lungs Bronchioles – The smaller ...
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Scott Foresman Science Grade 4
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... All living things have one thing in common – they all are made of cells. A cell is the smallest unit of life that can perform all life processes. Cells may look alike, but they may have very different jobs. Cells work together to build tissues. Tissues work together to make organs. Organs work toget ...
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... their DNA surrounded by a membranous envelope, a nucleus – and Prokaryotic cells in which the DNA is not isolated from the cell interior – bacteria. A bacterial chromosome is a single loop of DNA containing several thousand genes. The earliest cell microfossils were left by prokaryotes, bacteria-lik ...
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natural selection - faculty.fairfield.edu
natural selection - faculty.fairfield.edu

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22/18 INVESTIGATOR Name Jeremy P. Brockes Address Ludwig

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Cell Wall - (LTC) de NUTES

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Cell theory



In biology, cell theory is a scientific theory which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1838. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchow contributed to the theory. Cell theory has become the foundation of biology and is the most widely accepted explanation of the function of cells.The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells. The cell is the most basic unit of life. All cells arise from pre-existing, living cells, by biogenesis.
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