During the S phase in the cell cycle, the chromosomes are replicated so that there are two copies. These copies are necessary so that each daughter cell created during the M phase will have an identical copy of the DNA.
Therefore, the answer is A: The DNA must be replicated. 
The chromosomes joining, cell membrane expanding, and cytoplasm separating all happen during the M phase (mitosis).
        
             
        
        
        
Answer:
 (a) can be used to bend epithelial sheets into tubes.
Explanation:
The adherens junctions are cell-cell adhesions localized in places exposed to abrasion or mechanical stress, close to the apical membrane in epithelial cells is one of these locations. Some of their functions are the initiation and stabilization of cell-cell adhesion, <em>they join the actin cytoskeleton to the plasma membrane to form adhesive contacts between cells that contribute to the folding and bending of epithelial sheets,</em> therefore they can mediate adhesion and signaling. 
I hope you find this information useful and interesting! Good luck!
 
        
             
        
        
        
Sexual Reproduction. Meiosis can be pronounced (MIosis) but for the purposes of not getting it confuses me Mitosis, I pronounce it (MEosis), and the way I remember it is, (MEosis) is use for sexual REprodection, to make gamETES. Hope it helped! :)
        
             
        
        
        
The answer is 60% 
Biomes are regions which have similar climate as well as the vegetation. Many people have defined the biomes on different basis some based on temperature , some on vegetation and many others.Some major terrestrial biomes include tropical forests, savannas, deserts, tundra, temperate deciduous forests etc