Correct Answer: 3, 2, 1, 4

Solution : Given:

1. Absorption

2. Digestion

3. Nutrition

4. Excretion

First, start with Nutrition

1. Nutrition: This is the first step where an organism acquires nutrients from its external environment.

2. Digestion: Once the food is ingested, the process of digestion begins with the mechanical and chemical breakdown of food in the digestive system.

3. Absorption: After digestion, the nutrients are absorbed into the bloodstream through the walls of the small intestine.

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4. Excretion: In this step, the body eliminates these waste products through excretion processes like urination and defecation.

So, order become

1. Nutrition
2. Digestion
3. Absorption
4. Excretion

Hence, fourth option is correct.