A species of freshwater snail is introduced to many ponds on an island. In ponds with crayfish (a snail predator), the snails evolved a larger and more globular shell than in ponds without crayfish. In an experiment, a grad student puts together snails from both types of ponds and carefully records their mating attempts. She finds that the difference in shell size and shape prevents most mating attempts between snails from the two kinds of ponds. Which statement summarizes what is happening in this example?   Question 13 options:   In allopatry, mechanical isolation evolved as a by-product of natural selection   In allopatry, natural selection caused the evolution of post-zygotic barriers   In sympatry, behavioural isolation evolved through gene flow   In sympatry, behavioural isolation evolved through genetic drift

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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.