Speciation is the process by which new species are formed. which of the following circumstances is most likely to lead to speciation? a. a population becomes separated by environmental factors into two groups that do not reproduce with one another. b. a population is unable to compete with other species and becomes extinct. c. a population reproduces beyond the carrying capacity of the ecosystem in which the population lives. d. a population begins to develop sexual dimorphism between the males and females of the species.

Answer is A. A population becomes separated by environmental factors into two groups that do not reproduce with one another.

When a population of a species become geographically separated then gene flow between them stops. Over a period of time, the population may become genetically different in response to the natural selection due to different environments. Selection and genetic drift will act differently on these two separated populations. This will results into two separate species. This type of speciation is called allopatric speciation.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

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