How many types of elements together make up the xylem tissue? Name them.

Explanation

### Step-by-Step Solution:

1. **Understanding Xylem Tissue**:
- Xylem is a type of complex permanent tissue in plants.
- Its primary function is to conduct water and minerals from the roots to other parts of the plant.

2. **Identifying the Elements of Xylem**:
- Xylem is composed of several types of elements. We need to identify how many types there are and name them.
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