Can there be more than one tertiary consumer in one ecosystem?

Yes, an ecosystem can have multiple tertiary consumers. These organisms, which are typically carnivores that eat secondary consumers, can occupy similar ecological niches but may prey on different species or compete for the same prey. The presence of multiple tertiary consumers can enhance biodiversity and contribute to the stability of the ecosystem. However, the specific number and types of tertiary consumers depend on the ecosystem's structure and available resources.