Traditionally morphological features are used to construct phylogenic trees of related species. In recent years, molecular sequences of nucleic acids or proteins, called the "molecular clock” by some researchers, have been used to reveal phylogenic relations. This diagram shows phylogenic trees of selected groups of mammals. The tree A is based on morphological features, whilst the tree B is based on molecular data.   What statement about the differences of the two phylogenic trees is accurate? A. The common ancestors of Carnivora/Rodentia and Chiroptera/Primates are the same for tree A; they are different for tree B. B. The common ancestors of Carnivora/Rodentia and Chiroptera/Primates are the same for tree A; they are the same for tree B. C. The common ancestors of Carnivora/Rodentia and Chiroptera/Primates are different for tree A; they are different for tree B. D. The common ancestors of Carnivora/Rodentia and Chiroptera/Primates are different for tree A; they are the same for tree B.

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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.