Based on the question provided, the correct option to complete the sentence "Hay gran biodiversidad de" is "O peces."
Explanation:
1. The sentence structure indicates that there is a high biodiversity of something.
2. The options provided are "caballos" (horses), "cerdos" (pigs), "peces" (fish), and "asos" (which seems to be a typo).
3. In the context of biodiversity, it is common to refer to the variety of fish species found in an ecosystem, especially in marine environments like coral reefs.
4. Therefore, the most suitable option to complete the sentence would be "O peces," indicating a significant diversity of fish in the mentioned location.