Identify producers, primary consumers, secondary consumers, and tertiary consumers from the food web.

• Producers: Green plants
• Primary consumers (eat producers): Grasshoppers, Mice
• Secondary consumers (eat primary consumers): Lizard (eats Grasshoppers), Domestic cat (eats Mice), Snakes (eats Mice), Hawks (eats Grasshoppers, Mice - Correction: Hawks eat Lizards, Snakes, Domestic cat, not directly Grasshoppers or Mice based on arrows). Let's re-evaluate secondary consumers.
  • Lizard eats Grasshoppers (primary consumer). So Lizard is a secondary consumer.
  • Domestic cat eats Mice (primary consumer). So Domestic cat is a secondary consumer.
  • Snakes eat Mice (primary consumer) and Lizards (secondary consumer). So Snakes can be a secondary or tertiary consumer.
  • Hawks eat Lizards (secondary consumer), Snakes (secondary/tertiary consumer), Domestic cat (secondary consumer). So Hawks can be a tertiary or quaternary consumer.

A tertiary consumer is the third consumer in the chain (fourth trophic level).

Food Chain 1:
Green plants $\rightarrow$ Grasshoppers $\rightarrow$ Lizard $\rightarrow$ Snakes
(Producer $\rightarrow$ Primary Consumer $\rightarrow$ Secondary Consumer $\rightarrow$ Tertiary Consumer)

Food Chain 2:
Green plants $\rightarrow$ Mice $\rightarrow$ Snakes $\rightarrow$ Hawks
(Producer $\rightarrow$ Primary Consumer $\rightarrow$ Secondary Consumer $\rightarrow$ Tertiary Consumer)

• Green plants: No predators shown.
• Grasshoppers: Eaten by Lizard (1 predator).
• Mice: Eaten by Domestic cat, Snakes, Hawks (3 predators).
• Lizard: Eaten by Snakes, Hawks (2 predators).
• Snakes: Eaten by Hawks (1 predator).
• Domestic cat: Eaten by Hawks (1 predator).
• Hawks: No predators shown.

Mice have 3 predators, which is the highest variety.

The organism with the highest variety of predators is Mice.