Videos A to Z

• The Cell: Organelles

  
  • 3-5
  • 6-8
  • 9-12

  Organelles are the structures within cells that break down food, move water, and store nutrients.  » more info

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• The Cell: Plant cell membrane

  
  • 3-5
  • 6-8
  • 9-12

  Plant cells possess a cell membrane, which is located inside the cell wall. It allows certain materials to flow in and out of the cell.  » more info

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• The Cell: Plant cell wall

  
  • 3-5
  • 6-8
  • 9-12

  Plant cells are surrounded by a relatively rigid cell wall, which is made of cellulose.  » more info

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• The Cell: Structure of cell nucleus

  
  • 3-5
  • 6-8
  • 9-12

  The nuclear membrane surrounds and protects the nucleus. Located inside the nucleus is the nucleolus, where RNA and ribosomes are created.  » more info

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• The Cell: Vacuoles

  
  • 3-5
  • 6-8
  • 9-12

  Vacuoles store food and other materials for later use by the cell. They also store waste, and in plant cells, they store water.  » more info

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• The Changing Phases of Matter: Moving particles

  
  • 3-5

  The various states of matter are determined by the motion and speed of particles.  » more info

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• The Changing Phases of Matter: Particles in gases video clip

  
  • 3-5

  Particles in gases fly at high speeds in all directions and are not in any set pattern.  » more info

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• The Changing Phases of Matter: Particles in liquids video clip

  
  • 3-5

  Particles in liquids, while still packed closely together, move more freely past each other.  » more info

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• The Changing Phases of Matter: Particles in matter

  
  • 3-5

  Even though you can't see them, billions of tiny particles make up this pencil. All matter, even matter you can't see is made up of particles. Tiny particles in the smallest form consist of atoms that…  » more info

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• The Changing Phases of Matter: Particles in solids

  
  • 3-5

  Particles in solids are packed closely together. The particles move but not as much as in liquids. Particles in solids vibrate but they are more or less locked into place.  » more info

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