Science, 2009
  Grade Level:   4-5  
  EALR 1:   Systems  
  Big Idea:   Systems (SYS)  
  Core Content:   Complex Systems                   
  Description:   In prior grades students learned to think systematically about how the parts of objects, plants, and animals are connected and work together. In grades 4-5 students learn that systems contain smaller (sub-) systems, and that systems are also parts of larger systems. The same ideas about systems and their parts learned in earlier grades apply to systems and subsystems. In addition, students learn about inputs and outputs and how to predict what may happen to a system if the system's inputs are changed. The concept of a hierarchy of systems provides a conceptual bridge for students to see the connections between mechanical systems (e.g., cities) and natural systems (e.g., ecosystems).  
  Content Standard:   4-5 SYSA Systems contain subsystems.  
Students are expected to:
  • Identify at least one of the subsystems of an object, plant, or animal (e.g., an airplane contains subsystems for propulsion, landing, and control).