Final answer:
The proper movement through a food chain is Autotroph -> Primary Consumer -> Secondary Consumer -> Tertiary Consumer.
Step-by-step explanation:
The proper movement through a food chain is: Autotroph --> Primary Consumer --> Secondary Consumer --> Tertiary Consumer.
An autotroph is an organism that produces its own food, such as plants, through photosynthesis. They are at the base of the food chain. The primary consumers are herbivores that eat the autotrophs. Secondary consumers are carnivores that eat the primary consumers, and tertiary consumers are carnivores that eat other carnivores.
For example, in a grassland ecosystem, the grass (autotroph) is eaten by a rabbit (primary consumer), which is then eaten by a fox (secondary consumer), and finally the fox is eaten by a lion (tertiary consumer).
Learn more about Food Chains