In a science class, students should be engaged with at least one science concept and practice.
Science and Engineering Practices
"The development of science and engineering practices begins very early, even as babies and young children inquire about and explore how the world works. Formal education should advance students’ development of the skills necessary to engage in scientific inquiry and engineering design."
-2016 Massachusetts Science Technology and Engineering Standards (https://www.doe.mass.edu/frameworks/scitech/2016-04/STE-Standards.pdf)