Answer:
ok, so if an hiv is a virus that attacks the immune system, how does that affect you?
 if your immune system is weak in a moment, bad bacteria can enter your blood and cause problems and weaken your immune system even more. 
its really bad for a person's health, it weakens your immune system so your body has a tougher time fighting against a virus. 
 
        
                    
             
        
        
        
In comparison they both show feeding relationship in an ecosystem.
In contrast, a food chain is a simple linear feeding relationship while a food web is a complex feeding relationship.
2) The arrows is to show the direction of the feeding relationship
        
             
        
        
        
Bloooooooooooon . , ,jh .
        
             
        
        
        
A) after 1911 gradual increase in deaths pattern explains that smoking causes cancer !
b) after 2001 , the graph will continue decreasing, because of the steps taken by government, the steps by people itself !! that all helps in decreasing deaths and cancer number after 2001 !
        
             
        
        
        
Answer:
A. Reduction in soil mass proved that plants get their food from the soil. 
Explanation:
Plant take their food from the soil because in soil roots are present which absorb nutrients from the surrounding environment. The nutrients present in the soil comes from the decomposition of dead bodies of plants and animals and sometimes it is provided by the farmers in the form of fertilizers. The plant food contains nitrogen, phosphorus and potassium which is required in large amount for the better growth and development of the plant.