I have a bad habit of chewing on my finger nails
A spectroscope
Explanation:
The color of the light emitted by her flashlight can best be studied using a spectroscope.
Spectroscope is an instrument used to observe the light emitted by a substance.
Just like a prism, it splits up light using its different wavelengths.
The light entering the scope is split into its different component parts.
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After he ate, glucagon from the cookies increased his blood sugar levels
Insulin was secreted after he ate the cookies because his blood glucose was high.