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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.

Sometimes without even knowing it, people waste fresh water. write an editorial for our school newspaper. try to convince your readers that saving and recycling water should be something they do every day.

Hand washing is an important behavior that can cut down your chances of becoming sick with a communicable disease. select the best answer from the choices provided. t f