The base for hair follicles is in the .

epidermis
fatty layer
dermis
dentin

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

Convection currents are caused by differences in what two things?