Final answer:
Free resources have four key characteristics that include accessibility, reusability, diversity, and non-excludability.
Explanation:
Four characteristics of free resources:
- Accessible: Free resources are readily available to everyone.
- Reusable: They can be used multiple times without cost.
- Diverse: Free resources cover a wide range of topics and formats.
- Non-excludable: It is difficult to prevent others from using them once they are available.
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