Hyla versicolor and h. chrysoscelis are frogs which are morphologically indistinguishable, non-hybridizing and broadly sympatric in central texas. there is no evidence that these species utilize different natural resources and both reproduce throughout the spring and summer. mating involves males clutching the females but fertilization is external. these species are easily distinguished by their mating calls; males and females of h. versicolor are "slow trilling" whereas males and females of h. chrysoscelis are "fast-trilling." the factor that most likely maintains these forms as species is

reproductive isolation

Explanation: reproductive isolation is a factor that affects the speciation process. It is specially important in sympatric populations because blocks genetic flow within them due to physical, seasonal or behavioral differences.

In this particular case, there is a behavioral difference that allow individuals from a specie recognize each other through sound so they can reproduce and do not mix with other species.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

vodka and hennesy

explanation: