Are the thorn of Bougainvillea and tendril of cucurbita homologous or analogous. What type of evolution has brought such a similarity in them?

Explanation

### Step-by-Step Solution:

1. **Identify the Structures**: The question asks about the thorn of Bougainvillea and the tendril of Cucurbita.

2. **Understand the Functions**:
- The **thorn of Bougainvillea** serves a protective function, helping to deter herbivores.
- The **tendril of Cucurbita** serves a supportive function, allowing the plant to climb and support itself.

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