Which of the following adaptations was NOT required to facilitate the evolution of animal life on land?

Question

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A fully cartilaginous skeleton is not a necessary adaptation for animals to live on land. While some animals with cartilage-based skeletons, such as sharks, can survive on land for short periods of time, a fully cartilaginous skeleton is not required for the long-term survival and adaptation of animals on land. Water-conserving excretory systems, amniotic eggs, and waterproof skin, on the other hand, are essential adaptations that enable animals to live and reproduce away from water sources.

Which of the Following Adaptations Was NOT Required to Facilitate