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1, Number of people: There is a finite number of people living on Earth, but it's always changing due to births and deaths.
2. Individuals: People can be considered distinct individuals with unique characteristics.
3. Counting: We can't count every single person, but we can estimate the total population of the world.
4. Resource limits: The number of people living on Earth is limited by the availability of resources like food, water, and shelter.
5. Singleton or groups: We can think of humanity as a single group or many smaller groups, depending on how we define community or identity.