The correct answer is: C) Mycobacterium tuberculosis.  
Tuberculosis is an infectious disease that most commonly affects lungs. Mycobacterium tuberculosis is a small, aerobic, nonmotile bacillus type of bacteria responsible for this disease.
There are two forms of tuberculosis:
•	Latent-without symptoms
•	Active-with symptoms such as chronic cough, fever, sweats, weight loss..
People with active tuberculosis can spread it by the air while they cough, spit, speak, or sneeze.
 
        
             
        
        
        
The stronger survived and the weaker passed on... Those with a weaker immune system had trouble with sickness and usually ended up passing on but those with strong immune systems were stronger and healthier and lived.
 
        
             
        
        
        
Answer:
The correct answer is - warning system.
Explanation:
Warning systems are a type of system that could be technical or biological in nature that can help in assessing or inform about the possible danger or change in a particular setting such as ecosystem, weather, water quality, and many others. It helps in avoiding such threats before occurring or become serious threats.
Certain biological species that live or require a particular set of conditions for their survival and reproduction can act as a biological warning system for water pollution, air pollution.
 
        
             
        
        
        
Awnser:
She has two different alleles for eye shape, one from each parent
You always receive 1 allele from each parent, and you're heterozygous, those alleles are different.