Mouldy bread: A science experiment
I just bought a loaf of fresh-baked bread (without preservatives!) from the bakery. I placed a slice of bread in a ziploc bag, and left it out on the kitchen counter. I placed a second slice of bread in a separate ziploc bag and placed it in the refrigerator. I placed a third slice of bread in a different ziploc bag and placed it in the freezer. I left the slices of bread in each of the three places for 2 weeks. I observed the slices of bread for mould growth every other day.
What is mould? (Is it a bacterium, a fungus, or a virus?)

Explanation

### Step-by-Step Solution:

1. **Understanding Mold**: Mold is a type of living organism that belongs to the kingdom Fungi. It is not a bacterium or a virus.

2. **Characteristics of Mold**: Mold is multicellular and is composed of filamentous structures known as hyphae. These structures allow mold to grow and spread.

3. **Examples of Mold**: Common examples of mold include species such as Rhizopus, Aspergillus, and Penicillium. Each of these has different characteristics and can be found in various environments.

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