This no doubt will attract criticism from the usual sources. "Rather than asking that students simply 'know' the science of reproduction, the NGSS requires that they 'develop models to describe' its processes." It's a constructivist approach; rather than simply being given models, students need to build them for themselves. The reason (in my mind) is that each student's cognitive environment is unique, and models developed from this environment - you can't simply impose it from above. Aligned with this, the NGSS creates "three dimensional learning" (3D learning). "in 3-LS1-1, the basic Core Idea is reproduction, the SEP is use of models, and the CCC is patterns of change."
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