Construct two food chains ending with a tertiary consumer, and identify the organism with the most predators.

a) Construct two food chains ending with a tertiary consumer.

A tertiary consumer is an organism that feeds on secondary consumers.

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

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

b) Which organism has the highest variety of predators in the food web.

To find the organism with the highest variety of predators, we count the number of arrows pointing to each organism:

• Grasshoppers are eaten by Lizards (1 predator).
• Mice are eaten by Snakes, Domestic cat, and Hawks (3 predators).
• Lizards are eaten by Snakes (1 predator).
• Snakes are eaten by Domestic cat and Hawks (2 predators).
• Domestic cat has no predators shown.
• Hawks has no predators shown.

The organism with the highest variety of predators is Mice.