Letter c is correct answer hope that helps you
        
             
        
        
        
that it was a weak enough disease to use the anibiotic to kill it off if it were cancer they would have to use cemo therapy witch is EXTREMLY harmful to the pasient thats how my dad died so i know 
                     i hope this helps have a wonderful day
 
        
             
        
        
        
The enzyme pepsin acts on proteins to produce peptides which are later broken into amino acids in the small intestine
        
             
        
        
        
Chemical messengers and the Electrical signals are the two main methods by which cells communicate with each other to coordinate their functions and metabolic activities.
According to biologist, A cell communicates through chemical messengers, by sending the chemical signals to other cells and also receive that signal from another cell. Similarly, Electrical signals or impulses also work in the same way.
Therefore, body contains many types of lipids which works as a chemical messengers also electical signal or impulses can easily travel throught these lipids. Cell uses these chemical messengers and electrical impulses to communicate with other cell. Although, In order to trigger a response, these signals are transmitted across the cell membrane of the cell.
Learn more about cell communication here
brainly.com/question/18223077
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Answer: 
The effiency decreases at higher altitudes
Explanation:
The higher up a person is on a mountain, the thinner the air is due to the lack of plants that can grow. An example of this is Mount Everest. At a certian point on the mountain, called the "Death Zone", the air is too thin to supply enough oxygen to the human body to survive. That's why they bring oxygen tanks with them on their adventures.