Name the unicellular and multicellular forms of algae.

Explanation

### Step-by-Step Solution:

1. **Understanding Algae**:
- Algae are primitive plants that can perform photosynthesis. They do not have differentiated structures like roots and leaves.

2. **Defining Unicellular and Multicellular**:
- Unicellular organisms are made up of a single cell (where "uni" means one).
- Multicellular organisms are composed of more than one cell (where "multi" means many).
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