[Solved] The heritability of a trait refers to A)how many genes are involved in its heredity. B)the extent to which variability among people on the trait is explained by genetic factors. C)the percentage of genes involved in its heredity. D)the percentage of people who show an inheritance for the trait. E)the extent to which similarity among people on the traits is explained by environmental factors. Carbonate Rock: Sedimentary rocks, such as limestone, that are composed primarily of carbonate minerals. Microscopic Organisms: Tiny life forms, often unicellular, that are not visible to the naked eye and require a microscope to be observed. Mass Extinction: Mass Extinction is an event in which a significant, widespread, and rapid decrease in the biodiversity on Earth occurs, often due to catastrophic environmental changes. Extinction Event: A significant, widespread, and rapid decrease in the biodiversity on Earth, often characterized by the disappearance of a large number of species in a relatively short period.