Answer:
primary sources are directly from the event or person. for example a presidential speech.
a secondary would be like a news article about said speech
First map
1 cm------ 10 km
40 cm---- x
x= (40 * 10) /1
x= 400 km, Cincinnati is 400 km away from Cleveland.
Second map
1 cm------ 50 km
x---------- 400 km
x= (400 * 1) /50
x= 8, Cincinnati is 8 cm away from Cleveland.
Darwin's argument tells us that species develop their traits through natural selection due to competition, survival and reproduction. Diversification of species is an important part to make his argument valid because diversification suggest extinction of specie if it doesn't survive.
