Answer:
tar
Explanation:
tar is the reason your lungs go black because it is evaporated into the smoke that you breathe in and is known to be the most known cause of cancer
 
        
             
        
        
        
Answer:
Canada
Explanation:
mixed economy because it involves both private and public ownership of capital and resources. Goods and services are produced and provided by both governments and privately owned companies.
 
        
                    
             
        
        
        
Highest risk body fluid would be blood because it has high nutritional value and pathogen is multiplying on there. Most pathogen will be transmitted by blood.
Droplet from cough also highly contagious since it easily contacts with any part of the body. Inhalation also makes the infection easier since it contacts mucosa.
Vaginal secretion and seminal fluid can transmit many virus but it depends on how many virus in the blood.
Saliva is composed by water and enzyme so it's low risk on virus spread. But it's on the mouth(which wasn't sterile) so it can be contaminated by various things. 
In normal condition urine and spinal fluid is sterile, but in a case of infection, it can be contaminated.
Sweat is mostly water and salt so it's safe.
        
             
        
        
        
Your answer is: Know your family <span>health history and use reliable resources to research any family.illnesses because this will help you understand risks and available treatments. By process of deduction, doctor's appointments cannot perfectly ensure a lack of sickness, increasing sleep has studies that suggest it actually increases chances of weight gain, and performance-enhancing supplements are actually harmful if you don't need them. Good Luck!</span>