Hello, I need help answering number 20(including the sub-parts). Pls and thank you  20. A.)T / F Both negative frequency-dependent selection and positive frequency-dependent selection act to maintain genetic polymorphism. B.) T / F The mass extinction at the end of the Cretaceous caused the extinction of all non-avian dinosaurs. C.) T / F Natural selection can occur without any evolution in the next generation if individual differences in the trait are not heritable.

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Marine Evolution

Marine habitat is less explored, and hence, its biological diversity is far less known. The marine habitats are not constant due to their shifting nature, while the terrestrial habitats are more stable. Marine biology is the science that deals with the study of diverse marine species, their interactions, and behavioral characteristics.