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I use this worksheet as practice with my 7th/8th grade students when discussing radioactive decay. There are a few different methods all on the same worksheet, but I have found they like the table method best. One file contains the practice; the other file has my notes/answer key on it.

From the PBS Documentary series about Evolution, a set of 18 questions for the students to focus on as they watch the video. Answer key is included to review after. Video can be found via Youtube when searching for it.