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Abanana can be an excellent source of potassium in our diet. there is a naturally occurring, long-lived, radioactive isotope of potassium, 40-19k, which has a natural abundance of 0.0117% and a half-life 1.27 billion years. estimate the activity of a typical banana due to this potassium isotope assuming that most of the mass is in stable potassium.

When a person undergoes root canal treatment or another endodontic treatment: [select all that apply] a.) the inside of the tooth is carefully cleaned and disinfected. b.) air is forced into the canal to stop bleeding. c.) the inflamed/infected pulp is removed. d.) the inside of the tooth is filled and sealed with a rubber-like material called gutta-percha

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