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As we have planned before, today we are going to do an experiment on frog in the school lab. However, I’m in the middle of teachers meeting in Surabaya now. I’m going
back to Bandung tomorrow. So, for your today’s learning activity, please make groups of four and discuss the material in Chapter IV instead. We will do the experiment next week. Sorry for not being with you. Hendra

Why did Hendra change the scheduled activity?