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Characteristics of life No one definitive list:

Characteristics of life No one definitive list:. Possess an orderly structure- organization ! Require and use E nergy Reproduce new members of their species Respond to stimuli in their environment to maintain homeostasis Grow and develop

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Characteristics of life No one definitive list:

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  1. Characteristics of lifeNo one definitive list: • Possess an orderly structure- organization! • Require and use Energy • Reproduce new members of their species • Respond to stimuli in their environment to maintain homeostasis • Grow and develop • Species change over time through adaptation and evolve over very long periods of time

  2. R S O A E E R G D Oliver Always and Everyday Eats Really Rank Gross Doughnuts

  3. R espond to S timuli in environment O organized A dapt E volve E nergy needed and used R eproduce G row D evelop

  4. Respond to stimuli • Possess “irritability” – able to respond • Stimulus must be strong enough to elicit a response • Must respond to environmental stimuli to survive and/or reproduce • Homeostasis – maintain internal conditions or environment • By internal feedback systems – communicate

  5. Organization • One or more cells –unicellular, multicellular • Cells contain DNA molecules • Common set of compounds –organic; carbon & hydrogen • Simple to complex – at all levels • Maintain and repair organs organ systems tissues organisms cells populations compounds communities molecules ecosystems atoms biosphere

  6. Adaptation and Evolution • Inherited structure, behavior or internal process that enables organism to respond to environmental factors and live successfully • Only an adaptation if inheritable • Must match environment • Gradual accumulation of adaptations result in evolution • Result of mutation – not intentional • Must be able to be passed along or not an adaptation • Able to move in some manner to meet needs 15 min

  7. ENERGY REQUIRED • Ultimate source is the sun • Must be used to maintain all the other characteristics and stay alive; growth, reproduction, repair; homeostasis! • Must be obtained – ingested or absorbed; converted to a usable form • May be transformed and transferred but never created or destroyed • Respiration – exchange gases with environment • Require water for chemical reactions • METABOLISM –sum of all chemical reactions and energy exchange within an organism • Anabolic reactions – build up; simple >> complex • Catabolic reactions – break down; complex >> simple

  8. Reproduction • Marks a successful life • Continues the species • Group of organisms that can interbreed and produce fertile offspring • Pass on genes / DNA • Sexual and/or asexual

  9. Change over time • Grow – increase in size • Develop – change in abilities; + / - • Die – limited lifespans

  10. All living things… • Have every characteristic at some time in their life • Similar in the variety of processes they carry out

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