I believe group of cells working together and or performing the same task can be categorized also as a specialized tissue.
Answer:
The body needs protein to build and repair tissues to make hormones, enzymes, body chemicals e.t.c.
The body also uses protein as a building block of blood , bones, skin , muscles, cartilage e.t.c.
Explanation:
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The answer is B.
Im pretty sure water is important for some organisms.