SA:V

• Why can single-celled bacteria rely on diffusion?

  They have a high surface area to volume ratio
• What do large multicellular organisms require for substance exchange?

  Specialized exchange surfaces and transport systems
• What resources do single-celled organisms need to absorb?

  Oxygen, glucose, and amino acids
• What waste products do single-celled organisms need to eliminate?

  Carbon dioxide
• How does surface area to volume ratio affect organisms?

  It determines their ability to exchange substances
• What happens to surface area to volume ratio as organisms get larger?

  It decreases
• What is the volume of a 1 cm cube?

  1 cubic centimeter
• What is the surface area to volume ratio of a 1 cm cube?

  6 to 1
• Why do larger organisms need specialized exchange surfaces?

  To increase their surface area to volume ratio
• What transport system do larger organisms often have?

  The circulatory system
• What do plants use for substance exchange?

  Roots and leaves
• What tissues do plants use to transport substances?

  Phloem and xylem