Many meteorites are very old, more than 4 billion years old, and are used to study the early history of the solar system. What conclusion can be made about the source of meteorites found on Earth and why they are used to determine the age of Earth?

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

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