Aspen trees are the most widely distributed tree in North America. A forest of many aspen trees, some of which may be tens of thousands of years old, is actually one single clone. What is likely to be the greatest threat to the long-term survival of aspen forests?

Question

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Climate change is likely to have the greatest threat to the long-term survival of aspen forests as it is altering the aspen trees' typical moist and cool environment to a dry and warm one. This can lead to reduced growth, increased susceptibility to pests and diseases, and changes in ecological interactions with other species. The other options listed may also pose a threat, but are unlikely to have as significant an impact on the survival of aspen forests as climate change.

Aspen Trees Are the Most Widely Distributed Tree in North