Select the homologous structures from the combinations given below :
Forelimbs of whales and bats
Tuber of potato and sweet potato
Eyes of octopus and mammals
Thorns of Bougainvillea and tendrils of Cucurbita. (b) State the kind of evolution they represent.

Explanation

To solve the question, we need to identify the homologous structures from the given combinations and then state the kind of evolution they represent.

### Step-by-Step Solution:

1. **Understanding Homologous Structures**:
- Homologous structures are anatomical features in different species that share a common ancestry but may serve different functions. They have similar structural characteristics but evolved to perform different roles.

2. **Analyzing the Given Combinations**:
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