WA.1. Systems (SYS)
4-5.SYS. Complex Systems: 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).
4-5.SYSA. Students know that systems contain subsystems.
4-5.SYSA.1. 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).
WA.4. Life Science
LS1. Structures and Functions of Living Organisms
4-5.LS1. Structures and Behaviors: In prior years, students learned that all plants and animals have life cycles. In grades 4-5 students learn that plants and animals have different structures that work together to respond to various internal and external needs. Students compare various human and animal structures and reflect on how the different structures enable the organism to respond to external and internal needs. Students also learn that healthy body structures depend on good nutrition. These concepts are stepping-stones to later understanding of how structures are built up from cells.
4-5.LS1B. Students know that plants and animals have different structures and behaviors that serve different functions.
4-5.LS1B.2. Students are expected to describe the function of a given animal behavior (e.g., salmon swim upstream to spawn, owls hunt at night when prey are vulnerable).
4-5.LS1C. Students know that certain structures and behaviors enable plants and animals to respond to changes in their environment.
4-5.LS1C.1. Students are expected to give examples of how plants and animals respond to their environment (e.g., many plants grow toward the light, animals hide when they see a predator).