An indicator species is an organism whose presence, absence or abundance reflects a specific environmental condition. Indicator species can signal a change in the biological condition of a particular ecosystem, and thus may be used as a proxy to diagnose the health of an ecosystem.
        
             
        
        
        
Answer:
A. Interferons
Explanation:
According to Wikipedia, "Interferons are a group of signaling proteins made and released by host cells in response to the presence of several viruses. In a typical scenario, a virus-infected cell will release interferons causing nearby cells to heighten their anti-viral defenses."
 
        
             
        
        
        
e. decision making because a means that you have not reached a conclusion, be is more of "i only have so much" type of answer, c does not make sense, and definitely not d.
 
        
             
        
        
        
Answer:
In my opinion what you have to do is organize your days according to the activities you may start, especially if you are a working mother that after work have o bear all the burden with househoold and children. Then, if you want you could choose the activity that bests suits you.
Explanation:
 
        
             
        
        
        
Right wing left wing center