某同学在做“验证力的平行四边形定则”实验时，根据测量结果在白纸上画出如图所示的图，其中O为橡皮筋与细绳的结点．
如图为染色体与DNA的关系图．下列有关叙述错误的是（ ）
下列自然资源中，属于非可再生资源的是（ ）
____ He's my brother.
____ Who's that boy?
____ Yes, she is.
____ Is she your mother?
____ No, he isn't. He's my teacher.
____ Is he your father?
