Movement of the molecules of solids, gases or liquids from the region of their higher concentration to the region of their lower concentration is known as

Options

A. diffusion
B. osmosis
C. imbibition
D. active transport.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the movement of molecules from a region of higher concentration to a region of lower concentration. This is a fundamental concept in biology related to how substances move within different mediums.

2. **Identifying the Options**: The options provided are:
- A) Diffusion
- B) Osmosis
- C) Imbibation
- D) Active Process

3. **Analyzing Each Option**:
- **Osmosis**: This is specifically the movement of water molecules through a semi-permeable membrane from a region of higher water concentration (or lower solute concentration) to a region of lower water concentration (or higher solute concentration). It does not apply to solids or gases.
- **Imbibation**: This refers to the absorption of water by solids, particularly non-living materials like seeds and wood. It is not a general process for all states of matter.
- **Active Process**: This involves the movement of molecules against their concentration gradient, from a region of lower concentration to a region of higher concentration, which requires energy. This is not what the question describes.
- **Diffusion**: This is the process where molecules move from an area of higher concentration to an area of lower concentration. This applies to solids, gases, and liquids.

4. **Conclusion**: Based on the analysis, the correct answer is **Diffusion**. It is the only process that describes the movement of molecules from a region of higher concentration to a region of lower concentration for all states of matter.

5. **Final Answer**: The movement of the molecules of solids, gases, or liquids from the region of their higher concentration to the region of their lower concentration is known as **Diffusion**.

---