小明发现植物的根向地生长，茎向光生长，相邻的两片叶子总是不重叠的，这些现象说明生物具有（　　）

A．变异性

B．适应性

C．遗传性

D．能影响环境

He sat on his bed looking at his brother, _______ had his arms crossed and looked angry.

A．that

B．whom

C．who

D．which