Final answer:
A food chain consists of organisms dependent on each other for food, with the sun providing energy through photosynthesis. In this case, the food chain consists of the sun, tree, deer, and lion.
Step-by-step explanation:
A food chain is a series of organisms where each organism is dependent on the next as a source of food. In this case, the food chain can be represented as follows:
Sun → Tree → Deer → Lion
The sun provides energy for the tree through the process of photosynthesis. The tree is then consumed by the deer, which in turn is preyed upon by the lion. This represents the flow of energy and nutrients through the food chain.
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