I am not entirely sure about this. So maybe my response can help you find the answer a little better if my answer is not entirely right? 
These last three questions are referring to everything you just worked on. So all you would have to do is refer back to your previous answers. Recall that the titles of the "part 1, 2, and 3" are titled "crossing beak color and tail-feather length", "crossing beak color and feather color", and "mapping tail-feather length and feather color". 
1.List the distances between each pair of genes: 
beak color and tail-feather length: 20 MU 
beak color and feather color: 16 MU 
tail-feather length and feather color: 4 MU 
2.Which two alleles are the farthest apart? 
(the one that is 20 MU apart) Y and L 
3.Which two alleles are the closest together? 
(the ones that are 4 MU apart) L and B 
        
             
        
        
        
Ecosystems equilibrium is when populations of organisms in the ecosystem are balanced.
        
             
        
        
        
Answer:
Microorganisms can be found both in the external environment  (ecosystem) and the internal environment (microflora) of higher organisms.
Explanation:
Microorganisms (microbes) are microscopic forms of life that include bacteria, protists, fungi and animal species, these organisms can se differentiated by using laboratory techniques such as the Polymerase Chain Reaction (PCR) or by microscopes. These organisms are both beneficial and both beneficial and pathogenic for humans. For example, the microflora may be useful in digesting nutrients contained in the food. On the other hand, <em>Plasmodium falciparum</em> is a pathogen microorganism that is found in the digestive system of mosquitoes and cause malaria in humans.
 
        
             
        
        
        
Answer:
C.
Explanation:
Strictly speaking, the only type of reproduction in Paramecium is asexual binary fission in which a fully grown organism divides into two daughter cells. ... Autogamy (self-fertilization) is a similar process that occurs in one organism.