Can an organism be a secondary and a tertiary consumer in the same ecosystem?

Yes, an organism can be both a secondary and a tertiary consumer in the same ecosystem, depending on its diet and the available food sources. For instance, a carnivorous animal might primarily eat herbivores (making it a secondary consumer) but can also consume other carnivores when food is scarce, thus acting as a tertiary consumer. This flexibility in feeding behavior allows organisms to adapt to varying ecological conditions.