Answer:
all of the above can lead to increase in nitrogen
 
        
             
        
        
        
organism,community,population,ecosystem 
 
        
             
        
        
        
Answer:
A. Person to person.
Explanation:
The graph shows that the disease spreads slowly at first, then rapidly, and slowly at the end. This pattern of transmission is most characteristic of a disease spread from one person to the next. When only one person has the disease, the rate of transmission is slow because that person may only meet a few others. But as the number of people with the disease increases, the number of meetings that spread the disease also increase. At this time, the disease can spread very rapidly. The disease spreads more slowly again when there are only a few people remaining that do not have the disease. With foodborne and airborne diseases, the rate of disease spread is most rapid when the disease first arises and the greatest number of possible victims are available. Graphs of foodborne and airborne transmission show the greatest rate of disease spread at the start of the outbreak.
FYI: This isn't my explanation this is the explanation the question gives! :)
 
        
             
        
        
        
Tissues are groups of similar cells that have a common function. An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose is called an organ system
        
             
        
        
        
A best fit line is a straight line so it can't connect to every dot on the graph. If there were many points everywhere, the line would zigzag to much.
Best fit is meant to be an average of all the dots (data)
It's either C or D
For D, the line does not necessarily miss every one on purpose; a data point could be a part of the average.