Amarathon is a race that commemorates the run made by a greek soldier, pheidippides, that took place in august 490 bc. the soldier ran 26.2 mi. how many kilometers did he run?

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.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.