Answer:
Mouse
Step-by-step explanation:
If you follow the Rule of 10%, the mouse gains the most energy from the seeds. The snake and the hawk only get 10% of that energy the mouse has consumes.
For example, follow the rule of 10% pyramid.
Producers: 1,000,000 kcal (energy)
Primary Consumers: 100,000 kcal
Secondary Consumers: 10,000 kcal
Tertiary Consumers: 1,000 kcal
In this sense, the seeds are the producers, the mouse is the primary consumer, the snake is the secondary consumer, and the hawk is the tertiary consumer.