Food webs illustrate energy flow from primary producers to primary consumers (herbivores ... used to show different patterns in food chains between terrestrial and aquatic ecosystems (Figure ...

They always start with an organism that makes food. The producer. In this example, it's grass. The first consumer in the chain, in this case the grasshopper, is also called the primary consumer.

Ecosystems can be terrestrial (land-based ... form the base of the food chain by using photosynthesis to convert sunlight into energy. Primary consumers (herbivores) feed on plants, while ...