Why do some trees lose their leaves in winter but other trees stay green and keep their leaves?
user
That’s a good question. In general, it’s because different trees have different leaves and the weather has different effects on different leaves.  For example, if there are no leaves on the trees, the sunlight hits the ground, making it warm.  Some leaves absorb the sun, and it makes the leaf cells swell, increasing the size of the leaf and giving it a big surface area.
assistant
Why do some trees lose their leaves in winter but other trees stay green and keep their leaves?
user
That’s a good question. In general, it’s because different trees have different leaves and the weather has different effects on different leaves.  For example, if there are no leaves on the trees, the sunlight hits the ground, making it warm.  Some leaves absorb the sun, and it makes the leaf cells swell, increasing the size of the leaf and giving it a big surface area.
assistant
Why do some trees lose their leaves in winter but other trees stay green and keep their leaves?