Epithelial tissue in animals is non-vascular but permeable. Give reason.

Explanation

### Step-by-Step Solution:

1. **Definition of Epithelial Tissue**: Epithelial tissue is a type of tissue in animals that forms the protective outer layer of the body and lines internal organs and cavities.

2. **Non-vascular Nature**: Epithelial tissues are described as non-vascular because they do not contain blood vessels. Instead, they rely on the underlying connective tissue for nutrients and waste removal.

3. **Cell Arrangement**: The cells in epithelial tissue are closely packed together with minimal intercellular spaces. This close packing allows for effective protection and barrier functions.

...