Final answer:
The roles in the food web are as follows: Producers: Corn, Primary Consumers: Caterpillar, Deer, Mouse, Squirrel, Secondary Consumers: Crow, Tertiary Consumers: Cougar, Snake, Herbivores: Deer, Mouse, Squirrel, Carnivores: Cougar, Snake, Crow, Omnivores: Crow. The missing element from the food web is Microorganisms.
Step-by-step explanation:
The roles in the food web are as follows:
- Producers: Corn
- Primary Consumers: Caterpillar, Deer, Mouse, Squirrel
- Secondary Consumers: Crow
- Tertiary Consumers: Cougar, Snake
- Herbivores: Deer, Mouse, Squirrel
- Carnivores: Cougar, Snake, Crow
- Omnivores: Crow
From the given options, the Microorganisms are missing from the food web.