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What is Life?

What is Life?. Characteristics of Living Things. Made up of one or more cells. Displays organization. Grows and develops. Reproduces, hereditary info in DNA. Responds to environmental stimuli. Requires energy. Maintains homeostasis. Adaptations evolve over time. 1. Cells.

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What is Life?

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  1. What is Life?

  2. Characteristics of Living Things • Made up of one or more cells. • Displays organization. • Grows and develops. • Reproduces, hereditary info in DNA. • Responds to environmental stimuli. • Requires energy. • Maintains homeostasis. • Adaptations evolve over time.

  3. 1. Cells • A collection of living matter enclosed by a barrier (cell membrane). • Smallest units of life. • Unicellular and multicellular life forms.

  4. 2. Organization • Each organized structure has a specific function. • Organization increases from atoms to biomes http://www.ux1.eiu.edu/~cfruf/images/bio3002/els_le2.jpg

  5. 3. Growth and Development • Each organism has a distinctive life cycle. • Some mostly grow = increase in mass. • Others grow and develop through various life stages with different abilities.

  6. 4. Reproduction and heredity • Production of new organisms. DNA stores hereditary info. • Sexual- two cells from two different parents unite. • Asexual- one parent produces offspring.

  7. 5. Response to Stimuli • Reactions to internal and external stimuli are responses. • Organisms respond to changing environmental variables like light, temperature, and humidity.

  8. 6. Requires energy • Life requires a constant supply of energy. • Metabolism - sum of chemical reactions that break down or build up materials in an organism. • All energy ultimately comes from the SUN.

  9. 7. Homeostasis • Organisms keep conditions (i.e. water, temperature, pH, salt levels) in their bodies constant. • Metabolism in organisms is almost always constant.

  10. 8. Evolution • As a group or population, any kind of organism can inherit changes (adaptations) over time. • Ex: In absence of predators, these male guppies have large tails.

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