If an animal were to lose mobility and become sessile, genes involved in which function would most likely be gained over evolutionary time?

Question

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If an animal were to lose mobility and become sessile, its ability to defend itself would become crucial for survival. Therefore, genes involved in defense mechanisms, such as immunity and structural defense (e.g. spines, thorns), would most likely be gained over evolutionary time.

If an Animal Were to Lose Mobility and Become Sessile