Identify the examples of homologous structures from the following-
(i) Vertebrate hearts
(ii) Thorns in Bougainvillea and tendrils of Cucurbita.
(iii) Food storage-organs in sweet potato and potato.

Explanation

To identify the examples of homologous structures from the given options, we will analyze each option based on the definition of homologous structures.

### Step-by-Step Solution:

1. **Understanding Homologous Structures**:
Homologous structures are anatomical features in different species that share a common ancestry, even if they may serve different functions. They arise from a common developmental plan and indicate divergent evolution.

2. **Analyzing Option (i): Vertebrate Hearts**:
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