Which of the following is true regarding biomes, species and climate change?

Question

BlackTom AI · Accepted Answer

Warming climates cause biome and species range shifts toward the poles and higher elevations because organisms track the climatic conditions to which they are adapted.

1) Relevant knowledge points and concepts
- Biome: a major community type (e.g., tundra, boreal forest) defined largely by climate and dominant vegetation.
- Species climate envelope: the range of temperature/precipitation conditions a species tolerates.
- Range shifts: as climate zones move, species and biomes tend to track their suitable climate spatially (poleward/upward).
- Succession: primary succession occurs on newly formed substrate (lava, newly exposed rock after glacial retreat); secondary succession occurs where soil remains but community composition changes.
- Pleistocene and Holocene: past glacial–interglacial cycles moved biomes substantially over tens of thousands of years, so present-day distributions are not immutable.

2) Step-by-step reasoning
- Climate warming alters temperature and precipitation regimes, shifting the geographic position of climatic zones.
- Plants and animals adapted to particular climates will tend to migrate toward newly suitable areas (commonly northward in the Northern Hemisphere or to higher elevations).
- Observational studies document poleward shifts of tree lines, insect ranges, and phenological changes consistent with tracking climate.
- Primary succession requires a newly exposed abiotic surface; warming alone usually causes redistribution of existing communities (secondary succession or simply range shifts), not blanket primary succession everywhere.

3) Calculations
- No numerical calculations are required; reasoning is conceptual and evidence-based.

4) Why the correct answer is correct
- "In the northern hemisphere, many biomes are expected to move north to find cooler conditions" directly follows from the movement of climatic envelopes and documented poleward shifts of species and vegetation types under warming.

5) Why other options are incorrect
- "Biomes have been in their present locations for tens of thousands of years." is false: glacial cycles and Holocene changes have relocated many biomes over those timescales.
- "Primary succession will occur in response to climate warming" is misleading: primary succession only occurs where new substrate appears (rare as a general response to warming); most change is range shifts or secondary succession.
- "all of these are true" is incorrect because the other two statements are not generally true.

6) Conclusion
Therefore, the correct choice is: "In the northern hemisphere, many biomes are expected to move north to find cooler conditions," which matches the provided answer.

Which of the following is true regarding biomes, species and climate change?Single choice

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