characteristics of life. objectives list six characteristics of life describe how a living thing is...
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Characteristics of LifeCharacteristics of Life
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ObjectivesObjectives
• List six characteristics of life• Describe how a living thing is
organized• Explain why all living things
on Earth are not yet well understood
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The Characteristics of Life
The Characteristics of Life
How can you tell if something is alive?
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The Characteristics of Life
The Characteristics of Life
• Biologists have devised a list of 6 characteristics that define life.
• Something can be considered alive ONLY if it displays ALL 6 of the characteristics.
Anything that possesses all 6 of the characteristics of life is called an organism.
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• 1. Made up of Cell(s)
• 2. Cellular Organization celltissueorgansystemorganism
• 3. Growth & Development• 4. Reproduction• 5. Adaptation to environment
– response to a stimulus
• 6. Maintaining Homeostasis
The 6 characteristics of life:
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1. Cells1. Cells
• Basic unit of life
• All living things are made up of one or more cells
• Cells are made up of smaller parts called organelles
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2. Cellular Organization2. Cellular Organization
• Cell -> Tissue -> Organ -> Organ System -> Organism
• Specific parts of cells (organelles) carry out different functions
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3. Growth & Development3. Growth & Development
• All living organisms grow and develop during their life spans.
• Growth: an increase in the size of an organism due to an increase in the size and number of cells
• Development: all of the changes that take place throughout the life span of an organism
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4. Reproduction4. Reproduction
All living organisms are able to produce live offspring.
• Species produce offspring similar to themselves
• NOT essential of the survival of an individual organism
• Essential for continuation of the species
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• All living organisms are able to adapt to their surroundings.
• They are able to react, or respond to an environmental condition, or stimulus.
5. Adaptation to Environment:5. Adaptation to Environment:
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6. Homeostasis6. Homeostasis• All living organisms are able to maintain a
relatively constant internal environment. • Homeostasis: Maintain a constant stable
internal environment suitable for life
• When an organisms is unable to maintain homeostasis it dies
• Metabolism provides the raw materials and energy to maintain homeostasis Metabolism: sum of all the chemical reactions that
occur in the organism
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The Living WorldThe Living World
• World of biology is rich with organisms and diverse with different types of life yet many organism have yet to be discovered this and more will be discussed in classification.
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Fun Facts about Organisms Fun Facts about Organisms
• Largest Animal Alive Today Blue Whale
• 30 meters in length = 120 feet• weigh up to 130 metric tons (= 30 elephants)
• Largest Plant Alive Today Giant Sequoia Tree
• height over 100 meters = 300 feet
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More Fun FactsMore Fun Facts
• Smallest Living Things Bacteria
• As small as 1000 nanometers in length
• Viruses 100 times smaller than bacteria but can’t be
classified as an organism. Are viruses alive?