Joel claims that “Bright White Toothpaste” removes tooth enamel stains better than all other brands. Which of the following shou
ld be documented as evidence to support his claim? 1. The amount of toothpaste used
2. The shade of teeth before and after brushing
3. The type of toothbrush used to brush teeth
4. The size of tooth
The amount of toothpaste doesn't matter, but most dentists say just the size of a pea. The type of toothbrush doesn't matter as much, because they should be the same. The size of the tooth definitely doesn't matter.
You should take a picture of what your teeth look[ed] like before you brushed your teeth, and after you brushed your teeth. You can do this with many different kinds of toothpaste and see which ones make your teeth whiter or darker.
The independent variable in this instance is the bright white toothpaste, and if they’re claiming that it removes stains better than all, then that means that the dependent variable would be the shade of teeth!
The amount of toothpaste, the type of tooth brush, and the size of tooth are all variables of the experiment but will not determine if the claim is supported or not.
The same is true for our skin and our liver cells. Or our brain and muscle cells. Or any of the other 300 or so different cell types. These cells are different because they use the same set of genes differently.
Vinegar will also go inside of the egg due to it having a higher concentration of water than the egg does via osmosis.
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