a true story of my classmate in high school

不是生物老师也可以想出这样的冷笑话XD

Translation：

Leaf: My name is Leaf, a marten.

L: You want to know why I've got this strange name?
My parents said that I was borned from a leaf.
But who would trust it?

L: Only my physics teacher "trusts" it.
Physics teacher is the white one.

Teacher: Leaf, I don't see your homework here!
Do you like to go out and "enjoy" your photosynthesis?