Dalton noticed that 100 g of tin will combine with 13.5 g or 27 g of oxygen. He also noticed that the ratio of 13.5 to 27 is the same as the ratio of 1 to 2. This observation corresponds to which of the following conclusions?

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.