What occurs when two pieces of land change their vertical relationship to each other? a. Dip-slip
c. Tipping
b. Strike-slip
d. Subduction

The answer to this is A.

The reason its A is because a Dip-Slip is inclined fractures where the blocks have mostly shifted vertically. If the rock mass above an inclined fault moves down, the fault is termed normal, whereas if the rock above the fault moves up, the fault is termed reverse.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

density and pressure