- Why do tadpoles excrete ammonia then they undergo metamorphosis and excrete urea instead?

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How do I make my brain smarter for math and stuff like we don't know? Please find the missing numbers for these Pythagorean Theorem questions and round to the nearest tenth if necessary.Please show all work? How many total territories were there in 1870? A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4? A 500 mL sample of water is found to contain 0.02 g of Pb. What is the concentration of Pb in the solution?