In fact, no two individuals are the same in a __________. A: speciation B: species

地理物种形成学说认为：物种形成(allopatric speciation)过程大致分哪三个步骤？

Scientists have proposed many different evolutionary trees over the years. Evolutionary trees are useful to A: determine that all heterotrophic organisms belong to the kindgom Fungi. B: determine that all phototrophic organisms have derived from kingdom Plantae. C: analyze the type of speciation that occurred between 2 populations. D: evaluate which organisms are closely related.