If both adsorption and absorption take place simulataneously, the process is called ………..

Explanation

To answer the question, we need to understand the terms involved: adsorption and absorption.

### Step-by-Step Solution:

1. **Define Adsorption and Absorption**:
- **Adsorption** is the process where molecules adhere to the surface of a solid or liquid. It is a surface phenomenon.
- **Absorption** is the process where a substance is taken up into the volume of another substance. It involves the entire volume of the material.

...