Question

all animals depend on ______ for food.

Explanation:

In the context of biology (a subfield of Natural Science), animals are heterotrophs, meaning they cannot produce their own food. They depend on plants (or other organisms, but plants are the primary producers) directly or indirectly for food. Plants perform photosynthesis to make their own food, and animals either eat plants, eat animals that eat plants, etc. So the most appropriate answer here is "plants" (or "producers" more generally, but plants are the main producers in most ecosystems).

Answer:

plants