<em>The continental crust is up to 70 km thick.</em>  
<u>Explanation</u>:
Upto 40% of the earth is made up of continental crust. <em>Sedimentary, igneous and metamorphic ricks </em>make up the continental crust. It makes up the upper layer of <em>continents and shallow seabed</em> areas near the shores.  
<em>Continental crust</em> is thicker than oceanic crust with a thickness ranging from <em>25 km to 70km continental crust</em> makes up 70% of earth’s volume and is usually located above sea level with a few exceptions like the <em>Zealand continental crust</em> region which is largely under water.  
 
        
             
        
        
        
Volcanic activity 
fault lines
mnt. ranges
and siesmagraphs 
        
                    
             
        
        
        
Answer:
B) Krebs cycle (citric acid cycle)
Explanation:
Glycolysis breaks glucose into two pyruvate molecules. Pyruvate is decarboxylated into acetyl CoA and the reaction occurs in the matrix of mitochondria. In the mitochondrial matrix, acetyl CoA enters Kreb's cycle and is broken down into CO2 and H2O. For one molecule of acetyl CoA, two molecules of CO2 are released as a by-product. Therefore, out of three carbon atoms of pyruvate, two are released as CO2 during Kreb's cycle.
 
        
             
        
        
        
Answer:
Artificial selection.
Explanation:
The development by scientists of a new color in a rose is the result of artificial selection.
 
        
                    
             
        
        
        
Enzymes speed up the chemical reaction that takes place in cells. they are also important for digestion and metabolism.