Mystery #2Tier 2trees / winter
Why do pine trees stay green all winter while oak trees go bare?
In the depths of winter, an oak tree stands bare and grey, every leaf long gone. Right beside it a pine stays deep green, as leafy as it was in summer. Both are trees, both feel the very same cold. So why does one strip itself bare while the other holds on?
Your guess
What's your hunch: why does the pine keep its leaves while the oak lets them go?
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