A friend explained to
you that she combined
two substances and
saw a color change.
What additional
information would you
need to determine if this
change was a chemical
or physical change?

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An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Acommon kind of mechanical weathering is called