Why might a 200mg tablet of aspirin not have the same effect as a 200mg tablet of ibuprofen?

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Identify two types of chemical bonding in the source of dietary potassium

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ