What is the percentage of radioactive nuclei left after 3 half lives pass?

What’s a special glass that most beakers are made of

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption