Answer:
A abiotic disturbance is a disturbance that is not caused by living organisms. Based on that definition, the correct answer would be:
Forest fires
Step-by-step explanation:
Forest fires are an example of an abiotic disturbance because they are typically caused by non-living factors such as lightning strikes, volcanic activity, or human activity. While forest fires can have an impact on living organisms and ecosystems, they are not caused by living organisms themselves.
The other options listed in the question are examples of biotic disturbances:
Invasive plants are living organisms that can disrupt ecosystems by outcompeting native species for resources.
Bacterial disease and 4. Fungal disease are caused by living microorganisms that can affect the health and survival of plants and animals.
Therefore, the correct answer to the question is 3. Forest fires.