Scientists use various methods to determine how closely two species are related. One method is to compare their physical features, and another is to compare their DNA. Can scientists also use similarities in the embyros of two animal species to help determine how closely they are related? No, comparing embryos of organisms does not help determine how closely two species are related. Scientists can obtain the same information comparing adult organisms No, comparing embryos of organisms does not help determine how closely two species are related. The embryos change too much as they grow into adult organisms Yes, comparing embryos is a useful way of determining how closely two species are related. There may be important similarities in the features of the embryos, even when the adults look very different. Yes, it is sometimes useful to compare embryos, but only when the adults are very similar

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.