Answer:
Mitochondrial DNA.
Explanation:
Mitochondria is known as the power house of the cell and one of the important organelle responsible for the production of energy. Mitochondria contains its own DNA.
To understand the maternal ancestor history, the mitochondria DNA  must be studied. The mitochondria is solely obtained from the mother as the egg contains large amount of cytoplasm that contains mitochondria. The mitochondria can never be inherited from paternal origin as the sperm contains few amount of cytoplasm and mitochondria. 
Thus, the answer is mitochondrial DNA. 
 
        
             
        
        
        
The part of the root that contains transport tubes is the root hair. The primary role of the root hair is to absorb water and nutrients from the soil. They are hair-like and tubular in structure and are sometimes rarely visible by the naked eye. 
        
                    
             
        
        
        
Answer:
hair cells is most likely to replicate faster than the brain cell
Explanation:
__________
 
        
             
        
        
        
The kidneys of human body are main component of the excretory system and removes waste. When kidneys are not capable of funtioning normally, a dialysis machine is used for removing unwanted substances from the blood. It maintains the levels of required ion, minerals and electrolyets in the blood.
Read more on Brainly.com - 
brainly.com/question/82017#readmore
 
        
        
        
Photosynthesis is the process which uses sunlight and converts carbon dioxide and water into glucose which is the example of carbohydrate. Oxygen is also produce as product in this reaction
This phenomenon is explained by following equation.
6CO2+6H2O---->C6H12O6+ 6O2
Simply six mole of carbon dioxide and six mole of water reacts in the presence of sunlight yields one mole of glucose(carbohydrate) and 6mole of molecular oxygen.