Why is it unlikely that two contour lines will cross?

What is the best evidence for the plate tectonics?

Modern austria followed switzerland's economic model by a. exploiting its natural resources b. developing skilled-labor industries c. engaging in strip mining d. relying on a tourism industry

Plz 100 ! if changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. oxygen level in water is therefore a(n) with respect to the number of trout that a particular stream can support.