Answer:
a scar is a environmental change
Im not positive, but i believe that the heat on the burner would allow her to control the rate of reaction!
The answer is D.) all cell are composed of a membrane...
If a test tube has been used, and its contents is supposed to be disposed, carefully pour the contents to the lavatory with a confirmation of a professional (as it may damage the pipelines of the sink) and ensure that there are no splashes created that can contact the human skin. Wash the test tube thoroughly and let dry.
