A sample of an unknown element contains 20 atoms with a mass of 10.0129 amu and 80 atoms with a mass of 11.0093 amu. calculate the average atomic weight of the element. What is the element?

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime

Which coal field location is related to coal fields in the eastern united states and supports the theory of continental drift? eastern india southern africa western australia northern south america

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?