State the functions of blood

Explanation

### Step-by-Step Solution:

1. **Definition of Blood**: Blood is a vital fluid in the human body that serves multiple functions. It is classified as a fluid connective tissue.

2. **Composition of Blood**: Blood consists of approximately 55% plasma (the liquid component) and 45% formed elements, which include red blood cells (RBCs), white blood cells (WBCs), and platelets.

3. **Main Functions of Blood**:
- **Transportation**: One of the primary functions of blood is to transport essential substances throughout the body. This includes:
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