In a science experiment, equal-sized populations of two species of earthworms are placed in a terrarium filled with soil. Abiotic factors such as temperature and water supply are kept constant in the terrarium, as is food in the form of bread scraps. The population of each species is observed and counted each day. In agreement with the competitive exclusion principle, what is the MOST LIKELY outcome of the experiment over time?
A. Only one population will thrive; the other population will decrease to zero.
B. Both populations will reach the same size, which is the carrying capacity of the terrarium for earthworms.
C. One population will be about twice the size of the other.
D. Both populations will reach the same size, which is about half the carrying capacity of the terrarium for earthworms.