Step 1: Understanding the Concept
Ecological pyramids have several limitations.
Step 2: Limitations
They do not accommodate a food web, they assume a simple food chain that never exists in nature, and they give no place to saprophytes.
Step 3: Exception
Showing the relationship between organisms of trophic levels is the purpose of the pyramid, not a limitation.
Final Answer:
Showing the relationship between organisms of trophic levels is not a limitation.
\[ \boxed{\text{(B) }\text{it shows relationship between the organism of trophic level.}} \]