Given the food web provided, the frog is more likely to be a keystone species. This is because frogs consume both the grasshopper and the spider, which helps to control their populations and maintain the balance of the ecosystem. If the frog were to be removed from the food web, it could lead to an increase in the populations of grasshoppers and spiders, which could have cascading effects on the rest of the ecosystem. Therefore, the frog plays a crucial role in maintaining the stability of the food web and is therefore more likely to be a keystone species.
