Control Variables

 

 

Which control variables did you choose for these experiments? Reply to your classmates and discuss whether some of these are things that would be “coincidentally the same” versus ones that “you take deliberate action to keep the same.”
2. Surprise Starches
How did your “Starchy” foods respond compared to your hypotheses? Do you believe the results, or do you think the test may not have properly detected the appropriate chemicals? Reply to classmates and share similar results, suggest alternative means of identification, or identify likely sources of error.
3. Surprise Emulsifiers
Let me confess that we were SHOCKED when we first did this experiment on American cheese and no oil floated to the top. Emulsifiers, right! Research the nutritional components of one of your “fatty” foods to see which item is the emulsifier. Reply to classmates with similar results or suggest alternate emulsifiers. Do you still want to eat the food now that you’ve done this test? Why or why not?
You must participate in at least one of the discussions. Make sure you post at least once by the first post date (check the schedule), that some of your posts are replies to other classmates, and that you post at least three times.

 

Sample Solution

In order to fully understand the relationship between the class system and the writing system it is important to examine the formation of the written word. 70,000 years ago ‘the cognitive revolution’ began. This was the time when people started crafting spears for hunting, domesticating dogs and drawing on cave walls. The Hands Cave of Argentina shows the emergence of a species not just creative or intelligent, but aware of their potential to document their lifestyle for future generations to see. However, the cave drawings among other pictograms are subjective in meaning, unlike a language which is certain. During the Cognitive Revolution people lived a hunter-gatherer lifestyle which, unlike an empire or civilisation, did not require any documentation, much like a tribal society. This changed when people decided to farm.

The ‘agricultural revolution’ started once we decided to domesticate plants instead of moving from place to place in search of fertile grounds, we made permanent settlements. As the need to catalogue trade, farming materials and debt grew, so did the writing system. This brings us to the first evidence of a relationship between class and writing systems, found in the Fertile Crescent 9,000 years ago

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