Discover how a system may stay the same because nothing is happening or because things are happening that exactly balance each other out.
Unifying Concepts of Science.
Patterns of Change (POC)
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Understand that people can keep track of some things by seeing where they come from and where they go.
Provide examples that demonstrate that something may not work well (or at all) if a part of it is missing, broken, worn out, mismatched, or misconnected.
Understand that some changes are so slow or so fast that they are hard to see.
Demonstrate that if something consists of many parts, the parts usually influence one another.
Discover that things change in some ways and stay the same in some ways.