Answer:
15 B
16 C
17 B
18 A
Explanation:
In my opinion these are 100 percent sure answer 
 
        
             
        
        
        
Answer:
xylem and phloem
Explanation:
Xylem and phloem are basically the blood vessels of plants because they transport substances. 
 
        
                    
             
        
        
        
Nitrogen,<span>The atmosphere is composed of ~78% nitrogen and ~21% oxygen, with small amounts of other gases. The bulk composition of the earth by weight is mostly, iron, oxygen, silicon and magnesium, in that order, with all the other elements making up only about 5% of the earth's weight.</span>
        
             
        
        
        
Answer:
Interphase
Explanation:
Eukaryotic cells have two parts of the cell cycle: Interphase and mitotic phase. It is the interphase in which a cell typically spends most of its time. During interphase, a cell grows and carries out the metabolic activities for regular growth and maintenance.