Geographic isolation caused the separation of rainforest frog populations into a population in the
climate became wetter and warmer, causing the rainforest to expand. When males from the north
north and a population in the south. The separated populations later reconnected because the
mated with females from the south, the offspring failed to develop past the tadpole stage. When
males from the south mated with females from the north, the offspring developed more slowly than
the offspring of pairs of northern frogs. Based on these data, which event occurred while the two
populations of frogs were separated?
A. The two populations developed into new species.
B. The two populations mated with other species of frogs.
C. The two populations began a new method of reproduction.
D. The two populations had fewer offspring than before the separation.