The greenhouse effect traps heat near the surface and raises the temperature, just like a blanket. :)
<span>There are no choices given, but the event was most likely a physical one that would have barred the squirrels from seeing each other. Squirrels are a social creature, and the event that would have separated the populace could have been anything from a large fire to an earthquake that separated the squirrels from each other.</span>
The answer is Chronic<span> Stress</span>
