what is life? characteristics of living things. warm up i can… explain the 6 characteristics of...
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What is Life?Characteristics of Living Things
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Warm Up
I can… explain the 6 characteristics of life.
Write down your hw!
Warm up: Looking back over yesterday’s stations, what do you think makes something living?
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Which of these are living?
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BIO= life (components of life)
Currently living, once living or made from something living would all
be BIOTIC
If it doesn’t have components of life, its
ABIOTIC
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Living things=
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6 Characteristics of Organisms
Cellular organization
Composed of chemicals
Use Energy
Grow & Develop
Respond to surroundings
Reproduce
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1. Cellular Organization
-basic unit of structure and function-microscopic (very small so that you need a microscope to see them)-some are bigger ex. Eggs
-made of ONE cell ex. Bacteria
-made of MANY cells (most organisms) ex. YOU-have specialized cells ex. Nerve cells, muscle cells
Made of cells
Unicellular
Multicellular
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Plant cells
Animal cells
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2. Composed of Chemicals
-most abundant chemical in organisms
-energy source
-building materials
-genetic material (chemical instructions that direct cell activities
Water
Carbohydrates Proteins & Lipids
Nucleic Acids
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Water
Carbohydrates
Proteins & Lipids
Nucleic Acids
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3. Energy Use
-Cells use energy to keep living things alive
-cells are always hard at work!
-ex. repairing injured tissuesgrowingdigesting
blood delivers oxygen
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4. Growth & Development
- The process of becoming larger
- Process of change that occurs during an organism’s life to produce a more complex organism
ex. Cells become specialized
into nerve cells, muscle cells, etc.
**need to use energy to change and grow– not like a pick-up rusting
Growth
Development
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5. Response to Surroundings
-organisms react to changes in their environment ex. Plants face the sun, dogs shed fur, etc.
-a change in an organism’s surroundings that causes an organism to react
-an action or change in behavior
**activity
Stimulus (stimuli)
Response
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6. Reproduction
-the ability to produce offspringReproduce
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Journal: Scientists discover a new substance on a far off planet. The substance appears to move, duplicate, and grow. Further studies determine that the substance is composed of various chemicals. There are no other characteristics. Is this substance an organism? Why or why not. (BE SPECIFIC AND DETAILED)
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Life comes from Life
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Spontaneous Generation
-many years ago, people believed that living things arose from non-living sources
Ex. Swarms of flies were born from the rotting meat
-Italian doctor-proved in mid 1600’s that spontaneous generation does not occur
-Two tests which are identical in all ways except for one-the changed factor in a controlled experiment
theory
Fracesco Redi
Controlled experiment
Manipulated variable
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Redi’s experiment
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Pasteur’s experiment
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The Needs of Organisms
4 Basic needs must be satisfied
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1. Energy
-All organisms need energy-use food as their source-obtain energy in different ways
-Auto ”self” troph “feeder” (self-feeder)-use the food they make as their energy sourceEx. Plants
-hetero “other” troph “feeder (other feeder)-cannot make their own food-eat autotrophs, autotroph’s food, other heterotrophs Ex. Animals, mushrooms, slime molds
autotrophs
heterotophs
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Volox: freshwater autotroph
Uses sun’s energy to make
its own food
American
Lobster:
heterotroph
getting energy
by eating a
jellyfish
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2. Water
-All organisms need water to: break down food, growth, obtain chemicals, move substances within their bodies, & reproduce
-dissolves more chemicals than any other substances
-liquid blood is 92% water -makes it good for transporting waste out, nutrients in, etc.
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3. Living Space
-All organisms need living space to: get food, water and shelter
-limited resources can cause competition between organisms for living space(some even share)
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4. Stable Internal Conditions
-changing external conditions requires organisms to maintain stable conditions inside their bodies
-maintenance of stable internal conditions despite outer changes
Ex. Your body temperature should always remain 98.6 degrees F whether its -5 or 87 degrees outside
homeostasis