Differentiate between Passive transport and active transport

Explanation

### Step-by-Step Solution

**Step 1: Definition of Passive Transport**
- Passive transport is the movement of molecules across a cell membrane without the need for energy input. This process occurs along the concentration gradient, meaning substances move from areas of higher concentration to areas of lower concentration.

**Step 2: Definition of Active Transport**
- Active transport, on the other hand, is the movement of molecules against their concentration gradient, from areas of lower concentration to areas of higher concentration. This process requires energy, typically in the form of ATP (adenosine triphosphate).

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