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Published byἐλπίς Κουταλιανός Modified over 6 years ago
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How do we know if something is living or non-living?
Living Things How do we know if something is living or non-living?
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What are 5 characteristics that every living thing has in common?
Please answer this in your notebooks
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Biology Biology: Study of Life
Scientists that study life are called Biologists Biologists study 3 important questions: 1) How do living things work? 2) How do living things interact with the environment? 3) How do living things change over time?
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Characteristics of Life
There are 7 characteristics of life: Organization and Cells Response to a Stimulus Homeostasis Metabolism Growth and Development Reproduction Change Through Time
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1. Organization and Cells
Organization: High degree of order within an organisms internal and external parts ……Ex) Humans Cells: smallest unit that can perform all of life’s processes What is the difference between an Unicellular and a Multicellular organism and give me an example of each?
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Hierarchy of Organization
Within an organism, there is a Hierarchy of Organization. Organism Organ System Organ: Carry out specialized jobs Tissue: Group of Cells Cell Organelle Biological Model 6
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2. Response to a Stimulus What is a stimulus?
Physical or chemical change in the internal or external environment Why do organisms need to respond to a Stimulus? TO STAY ALIVE!
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3. Homeostasis Maintenance of a stable level of internal conditions even though environmental conditions are constantly changing Temp., water content, salinity, acidity, etc
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4. Metabolism Energy powers all of life’s processes
Metabolism is defined as the sum of all the chemical reactions that take in and transfer energy Plants? Humans?
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5. Growth and Development
All living things grow and increase in size Development is the process by which an organism becomes a mature adult Cell division is one form of growth and increase. Forming two cells from one existing
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6. Reproduction All organisms produce new organisms in a process called reproduction Genes: Short segment of DNA that are passed to offspring Two ways: Sexual and Asexual
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7. Change through Time Populations of living organisms evolve or change through time to compete or survive
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