What are the 2 major food chain?

There isn't really a concept of "2 major food chains". The concept of a food chain is more about the flow of energy through an ecosystem, and it's not about specific chains.

However, there are two main categories that food chains fall into:

1. Grazing Food Chains: These start with producers like plants, which are eaten by herbivores, which are then eaten by carnivores. Think of a classic chain like grass -> deer -> wolf.

2. Detritus Food Chains: These start with dead organic matter (detritus), which is broken down by decomposers like bacteria and fungi. These decomposers are then eaten by small organisms, and the energy flows up through the food chain.

So, instead of "2 major food chains", it's more accurate to say there are two major categories of food chains: grazing and detritus.

It's important to remember that these categories are not mutually exclusive. In reality, food webs are much more complex and interconnected, with many different food chains overlapping and interacting.