Final answer:
An example of a biotic factor is a plant, which provides food, shelter, and oxygen in ecosystems.
Step-by-step explanation:
An example of a biotic factor is a plant. Plants are living organisms that play an important role in ecosystems. They obtain energy through photosynthesis and provide food, shelter, and oxygen for other organisms. For example, in a forest ecosystem, trees provide a habitat for birds, insects, and mammals, and they also produce oxygen for other organisms to breathe.
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