Help please the classification level that includes the most specific traits

A. species
B. kingdom
C. class
D. order​

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?

Why are common names a problem for scientist?

Explain the function of a vacuole in plant cells?