Answer 1. a. acorns
2. c. secondary consumer
Step-by-step explanation:
A food chain is a sequence or series of transmission of energy in the form of food. The organisms appears as food components eaten up by other organisms.
1. a. acorns: The acorns are dried nuts which are produced by the oak trees. As it is a plant product it is expected to have the highest energy in the food chain. As plants are abundant in numbers and are the largest source of energy in the food chain.
2. c. secondary consumer: The fox is a secondary consumer as acorns are eaten up by the squirrels, here squirrel is the primary consumer. The squirrel will be eaten up by the fox. Hence, fox is the secondary consumer.