简述真核细胞起源对生物进化的意义。
参考答案：
1）为生物性分化和有性生殖打下基础。
2）推动生物向多细胞化方向发展。
A (71) is a data type whose major attributes are determined by the roles governing the insertion and deletion of its elements. The only element that can be deleted or removed is the one that was inserted most (72) . Such a structure is said to have a last-in/first-out (LIFO) behavior, or protocol.
A．quickly
B．recentness
C．recently
D．fast
掏槽孔布置原则是什么？
