1. A pack of wolves: Wolves are living organisms that interact with each other and their environment, impacting the population dynamics of prey species and influencing the plant life in their territory.

2. A colony of bacteria: These microscopic organisms play a crucial role in decomposition, nutrient cycling, and even human health, making them a vital biotic factor in many ecosystems.

3. A sunflower plant: Plants are living organisms that provide food and shelter for other organisms, contribute to oxygen production, and influence soil composition through their roots, making them a key biotic factor in their environment.