Describe the membrane of the axon Outside and Inside

For a study comparing leisure activities of physical education students with those of other students, a researcher has randomly selected a ten percent sample of physical education students and one percent sample of non-physical education students for a list of students. what kind of sampling technique is this?

Who needed protection from railroads? 1865-1900 apush

Explain one difference in the way elites used art or architecture in europe and in asia during the period 1450-1750.