Which structure is not found among animals that reproduce on land?

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In terrestrial vertebrates,males typically have a penis for depositing sperm into the vagina of females.In birds that lack a penis and vagina,a male transfers sperm to a female after placing his cloacal opening against hers.Following internal fertilization,reptiles usually lay a leathery-shelled egg containing extraembryonic membranes to serve the needs of the embryo and prevent drying out.One membrane surrounds an abundant supply of yolk,which is a nutrient-rich material.The shelled egg is a significant adaptation to the terrestrial environment.

Which Structure Is Not Found Among Animals That Reproduce on Land