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SAT Biology Subject Test Practice Questions

Category - Biology

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Which of the following is NOT a characteristic of a climax community?
  1. The vegetation is tolerant of environmental conditions.
  2. The essential makeup of the populations within the community is in constant flux.
  3. The ecosystem is balanced between energy production and consumption.
  4. The size and life spans of the organisms is constant.
  5. There is a high level of species diversity.
Explanation
Answer: B, The essential makeup of the populations within the community is in constant flux.

Key Takeaway: The primary characteristic of a climax community is stability. There is no change in environment, no change in population mixture, and no change in biomass. Species diversity has reached the highest level the region can support. Lifespan and organism size has reached its maximum. Since it is an area of stability, the balance between energy production and consumption propels the equilibrium.
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