Similarity:
Amoeba and human beings both require essential nutrients for survival and growth.

Difference:

Amoeba:
- Amoeba is a single-celled organism that obtains its nutrition through the process of phagocytosis.
- It feeds on smaller organisms like bacteria, algae, and other microorganisms by engulfing them through its cell membrane.
- Once the food is engulfed, it forms a food vacuole where digestion takes place.
- The nutrients are then absorbed into the cytoplasm for energy production and growth.

Human Beings:
- Human beings are multicellular organisms that require a variety of nutrients for proper functioning of the body.
- They obtain nutrition through a complex digestive system that involves ingestion, digestion, absorption, and assimilation of food.
- Human beings consume a diverse diet consisting of carbohydrates, proteins, fats, vitamins, and minerals to meet their nutritional requirements.
- The digestive system breaks down the food into smaller molecules that can be absorbed by the body and utilized for energy production, growth, and repair.
In conclusion, while both amoeba and human beings require essential nutrients for survival, the process of obtaining and digesting food differs significantly between the two organisms due to their distinct cellular structures and digestive systems.