Lichens are fascinating organisms that are actually a symbiotic relationship between two different organisms:

* A fungus: This is the primary component of the lichen, providing the structure and support.

* An alga or cyanobacterium: This organism provides the food for the fungus through photosynthesis.

The fungus provides a protected environment for the alga or cyanobacterium, and the alga or cyanobacterium provides food for the fungus. This symbiotic relationship is essential for the survival of both organisms.

Here's a simple analogy: Imagine the fungus is a house and the alga or cyanobacterium is the tenant. The house provides shelter and protection for the tenant, while the tenant pays rent by providing food.

So, a lichen is not made up of two organisms that combine to make a new organism. Instead, it's a symbiotic relationship where two distinct organisms live together, benefiting each other and creating a unique whole.