What do research interactions and main effects mean?  What do interactions reveal that main effects cannot?

Social mobility: social mobility refers to our chances of moving up or down within the american class structure. what do you think is the most important factor that leads to upward mobility? and why do you feel that way? race or ethnicity gender social class at birth hard work and education

Which european country lost control of lebanon and syria-their middle east mandates-in the 1940s? a) britain b) france c) germany d) italy

The symbols found on the map below indicate where fossils have been found in the same layer of sediment. each unique symbol represents fossil locations of a particular species.