What is endocytosis and exocytosis?

Explanation

### Step-by-Step Solution

1. **Definition of Endocytosis**:
- Endocytosis is the process by which cells take in substances from the outside environment. This occurs when the cell membrane engulfs the material, forming a vesicle that brings the substance into the cell.
- The prefix "endo-" means "inside," indicating that this process involves substances entering the cell.

2. **Types of Endocytosis**:
- There are different types of endocytosis, including:
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