Which of the following types of reproductive barriers separates two species of sea cucumbers,whose sperm and eggs often bump into each other but do not cross- fertilize because of incompatible proteins on their surfaces?

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Gametic isolation occurs when gametes (sperm and egg) of different species are incompatible and cannot fuse to form a zygote, therefore, preventing fertilization. In this case, the sperm and eggs of the sea cucumbers are not able to cross-fertilize due to incompatible proteins on their surfaces, leading to gametic isolation. Temporal isolation occurs when two species breed at different times. Mechanical isolation occurs when mating is attempted, but physical differences prevent successful mating. Habitat isolation occurs when species occupy different habitats and do not encounter each other.

Which of the Following Types of Reproductive Barriers Separates Two