As Early Explorers Traveled the Oceans and Observed the Distribution

As early explorers traveled the oceans and observed the distribution of plant and animal species on different continents, the pattern of species diversity was generally

A) evenly distributed throughout the latitudes.
B) highest at low latitudes, in the tropics.
C) highest at high latitudes, near the poles.
D) highest at medium latitudes, in the temperate zones.
E) highest in the tropics and lowest at the higher latitudes.