Here's why:

* Multicellular Filaments: Fungi are made up of thread-like structures called hyphae. These hyphae grow in networks called mycelia.

* Food Breakdown: Fungi are heterotrophs, meaning they cannot make their own food. They obtain nutrients by secreting enzymes that break down organic matter outside their bodies.

* Absorption: Once the food is broken down, fungi absorb the nutrients through their hyphae.

Let me know if you'd like more details about the fascinating world of fungi!