CELL IS BASIC UNIT OF LIVING THINGS Living Things are different from nonliving things: they have CHARACTERISTICS & NEEDS All living things are made of

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<ul><li><p>CELL IS BASIC UNIT OF LIVING THINGSLiving Things are different from nonliving things: they have CHARACTERISTICS &amp; NEEDSAll living things are made of CellsMicroscope led to discovery of CellsCells come from other CellsCELL THEORY is important to study of BIOLOGY</p></li><li><p>CHARACTERISTICS OF LIVING THINGSLiving things have these characteristics:Organization ( body must be organized to help it meet its needs)Ability to develop &amp; growAbility to respond to the environmentAbility to reproduce</p></li><li><p>NEEDS OF LIVING THINGSOrganisms need energy, material &amp; living space. All organisms need a steady supply of ENERGY to stay alive.Most all forms of life use energy originally from the Sun. Some, like plants &amp; bacteria, can capture the Suns energy to store it in food. The food animals eat comes from plants or other organisms (that eat plants)MATERIALS: Some comes from food for growth &amp; reproduction. Some from Nitrogen, Oxygen, Carbon Dioxide &amp; Water.LIVING SPACE: Need space to live &amp; grow.If any one of these requirements is missing, an organism will die.</p></li><li><p>ALL LIVING THINGS ARE MADE OF CELLSCell is smallest unit of living thing. One celled organisms are UNICELLULAR.If made of many cells: MULTICELLULARNeeds &amp; characteristics of single celled organisms are the same as for multicellular.In multicellular, many different types of cells work together to carry out basic activities of life.</p></li><li><p>MICROSCOPE LED TO DISCOVERY OF CELLSMicroscope = instrument which makes an object appear bigger than it is.In 1660s, Robert Hooke used a microscope to look at many materials. While looking at dead cork cells (from oak bark) he saw tiny, empty chambers or cells. He came up with the term CELL.In 1670s ANTON van LEEUWENHOEK looked at actual living cells in blood, teeth scrapings and rainwater.</p></li><li><p>Cells Come From Other CellsBy 1850s, scientists saw cells actually dividing. Observations and evidence gathered over many years by scientists became summarized in 3 concepts of CELL THEORY:Every living thing is made of 1 or more cells.Cells carry out the functions needed to support life.Cells come only form other living Cells</p></li><li><p>CELL THEORY IS IMPORTANT TO STUDY OF BIOLGOY</p><p>French Scientist, Louis Pasteur showed how microscopic organisms caused food spoilage &amp; disease.Found way to heat milk to kill bacteria, that he knew spoiled milk.Using a microscope, Pasteur found microorganisms everywhere (air, water, &amp; soil)Pasteur did an experiment (with boiling broth) showing bacteria are present in air &amp; dont grow spontaneously.</p></li></ul>

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