Observe that when parts are put together, they can do things that they couldn’t do by themselves.
Unifying Concepts of Science.
Systems and Energy (SAE)
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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.
Discover that collections of pieces (e.g., powders, marbles, sugar cubes or wooden blocks) may have properties that the individual pieces do not.
Realize that results of similar scientific investigations seldom turn out exactly the same, but if the differences are large it’s important to try to figure out why.
Demonstrate that if something consists of many parts, the parts usually influence one another.
Understand that some changes are so slow or so fast that they are hard to see.