Oil mines cover most of Nigeria. Thats why Nigeria specializes in oil preserves and stuff that deals with oil
 <span />
        
                    
             
        
        
        
Answer:
A key distinguishing factor between the two systems was land ownership. European knights gained land from their lords as payment for their military service; they had direct control of the serfs who worked that land. In contrast, Japanese samurai did not own any land.
Explanation:
 
        
             
        
        
        
Answer:
is an activity designed to test the validity of a hypothesis
Explanation:
The procedure which is carried out in order to support or validate a particular hypothesis is known as experiment. Experiments have varying goals and they always rely on the logical analysis of the experiment results. 
Researchers or scientist all over the world use experimentation to support or disprove the existing theories or the new hypotheses coming up.
 
        
             
        
        
        
Well that’s ever day I hate school
 
        
        
        
Answer:
White matter
Explanation:
Brain work like a computer. It is easier to understand the brain. White matter is the substance that connects all the matter and transmits the message. This is the nerve tissue in the brain that contains nerve fibers. The fibers connect the nerve fibers and these nerve fibers are covered by a myelin sheath.  
Myelin sheath help in improving the speed of information from one neuron to another neuron. The myelin speeds up the signal between cells and the signal cells which sends and receives cells.