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In increasing order of organizational complexity, which one of the following is the correct sequence?

1. Population, species, community, ecosystem
2. Population, variety, species, ecosystem
3. Population, ecosystem, species, community
4. Species, variety, ecosystem, community

Correct answer: Population, species, community, ecosystem

Solution

A population is a group of individuals of the same species in one area. Multiple populations form a community, and a community plus its nonliving environment forms an ecosystem, so the order increases as population → species → community → ecosystem.

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