examine the statements below and score them as true or false. 1. according to the macarthur-wilson theory of island biogeography, the immigration curve starts out steep but gets progressively shallower. (click to select) 2. the extinction curve also starts out steeply but quickly declines. (click to select) 3. extinction rates are lower on larger islands. (click to select) 4. the numbers of species should increase with increasing distance from the mainland. (click to select) 5. there should be considerable turnover of species on islands.