Epithelium provides a rigid shell to prevent punctures. Epithelium has capillaries to resist iron deficiency. Epithelium insulates the vertebrate from hypothermia. Epithelium prevents dehydration in vertebrates.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which explains how the epithelium offers protection to land-dwelling vertebrates?
Possibilities:
- Epithelium provides a rigid shell to prevent punctures.
- Epithelium has capillaries to resist iron deficiency.
- Epithelium insulates the vertebrate from hypothermia.
- Epithelium prevents dehydration in vertebrates.

Epithelium prevents dehydration in vertebrates.