About This Lesson
This introductory unit is aligned to: RFK1a, RFK2, SLK6, LK1, LK1a, LK1e
This work is based on an original work of the Core
Knowledge® Foundation made available through
licensing under a Creative Commons Attribution-
NonCommercial-ShareAlike 3.0 Unported License. This
does not in any way imply that the Core Knowledge
Foundation endorses this work
